Source: Wikipedia.org

The iPad (/ˈpæd/ eye-pad) is a line of tablet computers designed and marketed by Apple Inc., which runs Apple’s iOS operating system. The first iPad was released on April 3, 2010; the most recent iPad models, thefourth-generation iPad and iPad Mini, were released on November 2, 2012. The user interface is built around the device’s multi-touch screen, including a virtual keyboard. The iPad has built-in Wi-Fi and, on some models, cellular connectivity.

An iPad can shoot videotake photosplay music, and perform online functions such as web-browsing and emailing. Other functions—gamesreferenceGPS navigationsocial networking, etc.—can be enabled by downloading and installing apps; as of 2012, the App Store offered more than 700,000 apps by Apple and third parties.[14]

There are five generations of the iPad. The first generation established design precedents, such as screen size and button placement, that have persisted through all models. The iPad 2 added a dual core Apple A5processor and VGA front-facing and 720p rear-facing cameras designed for FaceTime video calling. The third generation added a Retina display, the new Apple A5X processor with a quad-core graphics processor, a 5megapixel camera, HD 1080p video recording, voice dictation, and 4G (LTE). The fourth generation adds theApple A6X processor and replaces the 30-pin connector with an all-digital Lightning connector. The iPad Minifeatures a reduced screen size of 7.9 inches, in contrast to the standard 9.7 inches, and features similar internal specifications as the iPad 2. iOS 6 adds Siri to the third and fourth generations and the iPad Mini.

Contents

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History

Steve Jobs, Apple’s then-CEO, introducing the iPad.

Apple’s first tablet from 1993

Apple co-founder Steve Jobs said in a 1983 speech[15] that his company’s

strategy is really simple. What we want to do is we want to put an incredibly great computer in a book that you can carry around with you and learn how to use in 20 minutes … And we really want to do it with a radio link in it so you don’t have to hook up to anything and you’re in communication with all of these larger databases and other computers.[15]

Apple’s first tablet computer was the Newton MessagePad 100,[16][17] introduced in 1993, which led to the creation of the ARM6 processor core with Acorn Computers. Apple also developed a prototype PowerBook Duo-based tablet, the PenLite, but decided not to sell it in order to avoid hurting MessagePad sales.[18] Apple released several more Newton-based PDAs; the final one, the MessagePad 2100, was discontinued in 1998.

Apple re-entered the mobile-computing markets in 2007 with the iPhone. Smaller than the iPad, but featuring a camera and mobile phone, it pioneered the multitouch finger-sensitive touchscreen interface of Apple’s iOS mobile operating system. By late 2009, the iPad’s release had been rumored for several years. Such speculation mostly talked about “Apple’s tablet”; specific names included iTablet and iSlate.[19] The actual name is reportedly a homage to the Star Trek PADD, a fictional device very similar in appearance to the iPad,[20] as well as being a variation of the word “iPod”. The iPad was announced on January 27, 2010, by Jobs at an Apple press conference at the Yerba Buena Center for the Arts in San Francisco.[21][22]

He later said that Apple had begun developing the iPad before the iPhone,[23][24] but had temporarily shelved the effort upon realizing that its ideas would work just as well in a mobile phone.[25] The iPad’s internal codename was K48, which was revealed in the court case surrounding leaking of iPad information before launch.[26]

Apple began taking pre-orders for the first-generation iPad from American customers on March 12, 2010.[3] The only major change to the device between its announcement and being available to pre-order was the change of the behavior of the side switch from sound muting to that of a screen rotation lock.[27] The Wi-Fi version of the iPad went on sale in the United States on April 3, 2010.[3][28] The Wi-Fi + 3G version was released on April 30.[3][4][4] 3G service in the United States is provided by AT&T and was initially sold with two prepaid contract-free data plan options: one for unlimited data and the other for 250 MB per month at half the price.[29][30] On June 2, 2010, AT&T announced that effective June 7 the unlimited plan would be replaced for new customers with a 2 GB plan at slightly lower cost; existing customers would have the option to keep the unlimited plan.[31]The plans are activated on the iPad itself and can be canceled at any time.[32]

The iPad was initially only available online at the Apple Store as well as the company’s retail locations, but has since become available for purchase through retailers including Amazon, Walmart, and network operators. The iPad was launched in countries including Australia, Canada, France, Germany, Japan and the United Kingdom on May 28.[33][34] Online pre-orders in those countries began on May 10.[4] Apple released the iPad in Hong Kong, Ireland, Mexico, New Zealand and Singapore on July 23, 2010.[35][36][37] Israel briefly prohibited importation of the iPad because of concerns that its Wi-Fi might interfere with other devices.[38] On September 17, 2010, the iPad was officially launched in China.[39]

300,000 iPads were sold on their first day of availability.[40] By May 3, 2010, Apple had sold a million iPads,[41]this was in half the time it took Apple to sell the same number of first generation iPhones.[42] After passing the one million mark they continued selling rapidly reaching 3 million sales after 80 days.[43] During the October 18, 2010, Financial Conference Call, Steve Jobs announced that Apple had sold more iPads than Macs for the fiscal quarter.[44] In total, Apple sold more than 15 million first-generation iPads prior to the launch of the iPad 2.[45] — selling more than all other tablet PCs combined since the iPad’s release.[46] and reaching 75% of tablet PC sales at the end of 2010.[47]

Jobs unveiled the iPad 2 at a March 2, 2011, press conference.[48][49] About 33% thinner than its predecessor and 15% lighter, the iPad 2 has a better processor, a dual core Apple A5 that Apple says is twice as fast as its predecessor for CPU operations and up to nine times as fast for GPU operations. The iPad 2 includes front and back cameras that support the FaceTime videophone application, as well as a three-axis gyroscope. It retained the original’s 10-hour battery life and had a similar pricing scheme.

The successor to the iPad 2 was unveiled on March 7, 2012 by Apple CEO Tim Cook at the Yerba Buena Center for the Arts.[50][51] The new iPad sports the new dual core A5X processor with quad-core graphics, and a Retina Display with a resolution of 2,048 by 1,536 pixels[52] this is over 50 percent more pixels than a standard 1,920 by 1,080 high definition TV screen. As with previous iPads, there are two models, in this case a Wi-Fi only model and a Wi-Fi + Cellular model.[52]

On October 23, 2012, Apple announced the fourth generation iPad, which began shipping on November 2, 2012. The new hardware includes an A6X processor, HD FaceTime camera, improved LTE compatibility, and the all-digital Lightning connector. It is available in the same storage increments and pricing structure as the third generation.[53][54] Following the announcement of the fourth-generation iPad, the previous generation was discontinued.

Alongside the launch of the 4th generation hardware, Apple announced the iPad Mini. With a screen measuring 7.9 inches, it is aimed at the emerging sector of smaller tablets such as the Kindle Fire and Nexus 7. The hardware of the new iPad Mini is similar to the iPad 2, with a 1024 by 768 pixel resolution screen and a dual core A5 processor, but is 53% lighter and 7.2mm thick. It was released on November 2, in 16GB, 32GB, and 64GB capacities and WiFi or Wi-Fi + Cellular versions.[54]

Hardware

Screen and input

The original iPad in its black case. For the iPad 2, Apple sells a Smart Cover rather than a case.

The iPad’s (first two generations) touchscreen display is a 1,024 by 768 pixel, 7.75×5.82 in (197×148 mm)liquid crystal display (diagonal 9.7 in (246.4 mm)), with fingerprint- and scratch-resistant glass. Steve Jobs said a 7-inch screen would be “too small to express the software” and that 10 inches was the minimum for a tablet screen.[55] Like the iPhone, the iPad is designed to be controlled by bare fingers; normal, non-conductive gloves and styli do not work,[56] although there are special gloves and capacitive styli designed for this use.[57][58]

The display responds to other sensors: an ambient light sensor to adjust screen brightness and a 3-axisaccelerometer to sense iPad orientation and switch between portrait and landscape modes. Unlike the iPhone and iPod Touch’s built-in applications, which work in three orientations (portrait, landscape-left and landscape-right), the iPad’s built-in applications support screen rotation in all four orientations, including upside-down. Consequently, the device has no intrinsic “native” orientation; only the relative position of the home button changes.[59]

There are four physical switches on the iPad, including a home button near the display that returns the user to the main menu, and three plastic physical switches on the sides: wake/sleep and volume up/down, plus a software-controlled switch whose function has changed with software updates. Originally the switch locked the screen to its current orientation, but the iOS 4.2 changed it to a mute switch, with rotation lock now available in an onscreen menu.[60] In the iOS 4.3 update, released with the iPad 2, a setting was added to allow the user to specify whether the side switch was used for rotation lock or mute.[6]

The first generation iPad had no camera; the iPad 2 has a front VGA camera and a rear-facing 720p camera, both capable of still images (but these are only taken at a low quality 0.3 megapixels) and 30fps video. The rear-facing camera has a 5× digital zoom for still images only. Both shoot photo and video in a 4:3 fullscreen aspect ratio, unlike the iPhone 4, which shoots in a 16:9 widescreen aspect ratio. Unlike the iPhone, the iPad does not support tap to focus, but does allow a tap to set auto exposure.[61] The cameras allow FaceTimevideo messaging with iPhone 4, fourth generation iPod Touch, and Snow LeopardLion, and Mountain LionMacs.[62]

Audio and output

The iPad has two internal speakers reproducing left and right channel audio located on the bottom-right of the unit. In the original iPad, the speakers push sound through two small sealed channels leading to the three audio ports carved into the device,[12] while the iPad 2 has its speakers behind a single grill.[10] A volume switch is on the right side of the unit. A 3.5-mm TRRS connector audio-out jack on the top-left corner of the device provides stereo sound for headphones with or without microphones and/or volume controls. The iPad also contains a microphone that can be used for voice recording.

The built-in Bluetooth 2.1 + EDR interface allows wireless headphones and keyboards to be used with the iPad.[63] However iOS does not currently support file transfer via Bluetooth.[64] iPad also features 1024×768 VGA video output for limited applications,[65] screen capture,[66] connecting an external display or television through an accessory adapter.

Battery

The iPad uses an internal rechargeable lithium-ion polymer (LiPo) battery. The batteries are made in Taiwan by Simplo Technology (60%) and Dynapack International Technology.[67] The iPad is designed to be charged with a high current of 2 amperes using the included 10 W USB power adapter and USB cord with a USB connector at one end and a 30-pin dock connector at the other end. While it can be charged by a standard USB port from a computer, these are limited to 500 milliamperes (0.5 amps). As a result, if the iPad is running while powered by a normal USB computer port, it may charge very slowly, or not at all. High-power USB ports found in newer Apple computers and accessories provide full charging capabilities.[68]

Apple claims that the battery for both generations of iPad can provide up to 10 hours of video, 140 hours of audio playback, or one month on standby. Like any rechargeable battery technology, the iPad’s battery loses capacity over time, but is not designed to be user-replaceable. In a program similar to the battery-replacement program for the iPod and the original iPhone, Apple will replace an iPad that does not hold an electrical charge with a refurbished iPad for a fee of US$99 plus $6.95 shipping.[69][70] As a different unit is supplied, user data is not preserved. The refurbished unit will have a new case.[71] The warranty on the refurbished unit may vary between jurisdictions.

Independent companies also provide a battery replacement service, returning the original unit with new battery but original case. Alternatively it is possible for a technically competent user to buy and install a new battery, which may invalidate any remaining warranty on the iPad. The task does not require soldering, but is technically challenging.[72]

Storage and SIM

The iPad model with data connectivity, unlike the Wi-Fi model, has a black plastic piece on the underside which allows cellular signals to pass through it.

The iPad was released with three capacity options for storage: 16, 32, or 64 GB of internal flash memory. On January 29, 2013, Apple announced a 128 GB model of the fourth generation iPad, which is to be released on February 5.[8] All data is stored on the internal flash memory, with no option to expand storage. Apple sells a “camera connection kit” with an SD cardreader, but it can only be used to transfer photos and videos.[73]

The side of the Wi-Fi + 3G model has a micro-SIM slot (not mini-SIM). The 3G iPad can be used with any compatible GSMcarrier, unlike the iPhone, which is usually sold ‘locked’ to specific carriers.[74] In the U.S., data network access via T-Mobile’s network is limited to slower EDGE cellular speeds because T-Mobile’s 3G Network uses different frequencies.[75][76]The iPad 2 introduced a third tier of models with CDMA support for Verizon Wireless in the United States, available separately from the AT&T capable version.[77]

Accessories

Main article: iPad accessories

Apple offers several iPad accessories,[78] most of which are adapters for the proprietary 30-pin dock connector, the iPad’s only port besides the headphone jack.[6] A dock holds the iPad upright at an angle, and has a dock connector and audio line out port. Each generation of iPad requires a corresponding dock. A dock that included a physical keyboard was only supported for the original iPad,[79] but all generations are compatible with Bluetooth keyboards that also work with Macs and PCs. The iPad can be charged by a standalone power adapter (“wall charger”) also used for iPods and iPhones, and a 10 W charger is included with the iPad.

Apple sells a camera connection kit that consists of two separate adapters for the dock connector, one to USBType A, the other an SD card reader. Adapter can be used to transfer photos and videos and to plug USB audio card or MIDI keyboard.[80] A third party sells an adapter that includes USB, SD, and microSD on a single unit.[81]An adapter to VGA connectors allows the iPad to work with external monitors and projectors. Another adapter mirrors the screen onto HDMI compatible devices in 1080p and works with all apps and rotations. Unlike other adapters, it allows the iPad to charge through another dock connector.[82] While the HDMI adapter was released with and advertised for the iPad 2, it also works with the first-generation iPad, the iPhone 4, and the fourth generation iPod Touch.[83]

A Smart Cover can be used as a stand for the iPad 2 while the display is in use.

Smart Covers are screen protectors that magnetically attach and align to the face of the iPad 2. The cover has three folds which allow it to convert into a stand, which is also held together by magnets.[84] While original iPad owners could purchase a black case that included a similarly folding cover, the Smart Cover is meant to be more minimal, easily detachable, and protects only the screen. Smart Covers have a microfiber bottom that cleans the front of the iPad, which wakes up when the cover is removed. There are five different colors of both polyurethane and leather, with leather being more expensive. Smart Covers are not compatible with the original iPad.[85] In June 2012, Apple started selling the Smart Case – a case with the combined function of a smart cover and a back protection case which is compatible with the second and third generation iPads.[86]

Software

Like the iPhone, with which it shares a development environment[87] the iPad only runs its own software, software downloaded from Apple’s App Store, and software written by developers who have paid for a developer’s license on registered devices.[88] The iPad runs almost all third-party iPhone applications, displaying them at iPhone size or enlarging them to fill the iPad’s screen.[89] Developers may also create or modify apps to take advantage of the iPad’s features.[90] Application developers use iOS SDK for developing applications for iPad.[91]The iPad originally shipped with a customized iPad-only version of iPhone OS, dubbed v3.2. On September 1, it was announced the iPad would get iOS 4.2 by November 2010;[92] to fulfill this Apple released iOS 4.2.1 to the public on November 22.[93]

Interface

The interface is based around the home screen, a graphical list of available applications. The home screen can be accessed at any time by a hardware button below the screen, closing an open application in the process.[94]

Users can also add and delete icons from the dock, which is the same on every home screen. Each home screen holds up to sixteen icons, and the dock holds up to four icons. Users can delete Web Clips and third-party applications at any time, and may select only certain applications for transfer from iTunes. Apple’s default programs, however, may not be removed.

Almost all input is given through the touch screen, which understands complex gestures using multi-touch. The iPad’s interaction techniques enable the user to move the content up or down by a touch-drag motion of the finger. For example, zooming in and out of web pages and photos is done by placing two fingers on the screen and spreading them farther apart or bringing them closer together, a gesture known as “pinching“.

Scrolling through a long list or menu is achieved by sliding a finger over the display from bottom to top, or vice versa to go back. In either case, the list moves as if it is pasted on the outer surface of a wheel, slowly decelerating as if affected by friction. In this way, the interface simulates the physics of a real object.

Other user-centered interactive effects include horizontally sliding sub-selection, the vertically sliding keyboard and bookmarks menu, and widgets that turn around to allow settings to be configured on the other side. Menu bars are found at the top and bottom of the screen when necessary. Their options vary by program, but always follow a consistent style motif. In menu hierarchies, a “back” button in the top-left corner of the screen displays the name of the parent folder.

Multimedia

The layout of the music library is similar to that of an iPod or current Symbian S60 phones. The iPad can sort its media library by songs, artists, albums, videos, playlistsgenres, composers, podcastsaudiobooks, and compilations. Options are always presented alphabetically, except in playlists, which retain their order from iTunes. The iPhone uses a large font that allows users plenty of room to touch their selection.

Users can rotate their device horizontally to landscape mode to access Cover Flow. Like on iTunes, this feature shows the different album covers in a scroll-through photo library. Scrolling is achieved by swiping a finger across the screen. Alternatively, headset controls can be used to pause, play, skip, and repeat tracks.

The iPad supports gapless playback.[95] Like the fifth-generation iPods introduced in 2005, the iPad can play digital video, allowing users to watch TV shows and movies in widescreen. Double-tapping switches between widescreen and fullscreen video playback.

The iPad allows users to purchase and download songs from the iTunes Store directly to their iPad. It includes software that allows the user to upload, view, and email photos taken with the camera. The user zooms in and out of photos by sliding two fingers further apart or closer together, much like Safari. The Camera application also lets users view the camera roll, the pictures that have been taken with the iPad’s camera. Those pictures are also available in the Photos application, along with any transferred from iPhoto or Aperture on a Mac, or Photoshop on a Windows PC.

Internet connectivity

The iPad can use Wi-Fi network trilateration from Skyhook Wireless to provide location information to applications such as Google Maps. The 3G model supports A-GPS to allow its position to be calculated with GPS or relative to nearby cellphone towers; it also has a black strip on the back to aid 3G reception.[96] The iPad has a headphone jack and a proprietary Apple dock connector, but no Ethernet or USB port.[6] However, the Apple Camera Connection Kit accessory provides two dock connector adapters for importing photos and videos via USB and SD memory cards.

Applications

The iPad comes with several applications, including Safari, Mail, Photos, Video, iPod, iTunes, App Store, iBooksMaps, Notes, Calendar, and Contacts.[97] Several are improved versions of applications developed for the iPhone or Mac.

The iPad syncs with iTunes on a Mac or Windows PC.[21] Apple ported its iWork suite from the Mac to the iPad, and sells pared down versions of Pages,Numbers, and Keynote apps in the App Store.[98] Although the iPad is not designed to replace a mobile phone, a user can use a wired headset or the built-in speaker and microphone and place telephone calls over Wi-Fi or 3G using a VoIP application.[99] As of June 2012, there were about 225,000 iPad specific apps on the App Store.[100]

In December 2010, Reuters reported that iPhone and iPad users have lodged a lawsuit against Apple alleging that some applications were passing their information to third party advertisers without consent.[101]

iBooks

Reading a book on the iPad

Further information: iBookstore

The iPad has an optional iBooks application that can be downloaded from the App Store, which displays books and other ePub-format content downloaded from the iBookstore.[102] For the iPad launch on April 3, 2010, the iBookstore is available only in the United States.[3][21][97] Several major book publishers including Penguin Books, HarperCollins, Simon & Schuster and Macmillan have committed to publishing books for the iPad.[103]Despite being a direct competitor to both the Amazon Kindle and Barnes & Noble Nook,[104] both Amazon.comand Barnes & Noble have made Kindle & Nook apps available for the iPad.[105][106]

In February 2010, Condé Nast said it would sell iPad subscriptions for several of its magazines by June.[107]

In April 2010, the New York Times announced that it would begin publishing daily on the iPad.[108] The “Top News” section is available free of charge, and the remainder on payment of a subscription.[109] Major news organizations, including the Wall Street Journal, the BBC, and Reuters have released iPad applications. NewsCorp created an iPad-only publication, The Daily, in February 2011.[110]

Model comparison

Further information: iPad technical specifications
Model iPad (1st generation) iPad 2 iPad (3rd generation) iPad (4th generation) iPad Mini
Status Discontinued Available Discontinued Available Available
Announcement date January 27, 2010[21] March 2, 2011[45] March 7, 2012 16, 32, 64 GB: October 23, 2012
128 GB: January 29, 2013
October 23, 2012
Release date April 3, 2010[3] March 11, 2011[111] March 16, 2012 16, 32, 64 GB: November 2, 2012
128 GB: February 5, 2013
November 2, 2012
Discontinued March 2, 2011[45] 32, 64 GB: March 7, 2012
16 GB: In production
October 23, 2012 In production In production
Display 9.7 inches (250 mm) multitouch display with LED backlighting and a fingerprint and scratch-resistant coating[6] 7.9 inches (200 mm)multitouch LED display
1,024 × 768 pixels at 132 ppi 2,048 × 1,536 pixels at 264 ppi (Retina Display) 1,024 × 768 pixels at 163 ppi
SoC Apple A4[7] Apple A5 Apple A5X[112] Apple A6X Apple A5
CPU 1 GHz ARM Cortex-A8 1 GHz dual-core ARM Cortex-A9 1 GHz dual-coreARM Cortex-A9 1.4 GHz dual-coreApple Swift 1 GHz dual-core ARM Cortex-A9
GPU PowerVR SGX535 PowerVR SGX543MP2 PowerVR SGX543MP4 PowerVR SGX554MP4 PowerVR SGX543MP2
Memory 256 MB DDR RAM built into Apple A4 package[9] 512 MB DDR2 (1066 Mbit/sdata rate) RAM built into Apple A5 package[10] 1024 MB DDR2[11] 1024 MB DDR2[113] 512 MB DDR2 RAM built into Apple A5 package[114]
Storage 16, 32, or 64 GB[6] 16, 32, 64, or 128 GB[6][8] 16, 32, or 64 GB[6]
Wireless Wi-Fi Wi-Fi (802.11a/b/g/n), Bluetooth 2.1+EDR[6] Wi-Fi (802.11a/b/g/n), Bluetooth 4.0
Wi-Fi+3G/4G In addition to above:
3G cellular HSDPA, 2G cellular EDGE on 3G models[6]
In addition to above and left:
3G transitional LTE on 4G model
Geolocation Wi-Fi Wi-Fi,[6] Apple location databases[115]
Wi-Fi+3G/4G Assisted GPS, Apple databases,[115] Cellular network[6] Additionally: GLONASS
Environmentalsensors Accelerometerambient light sensor,magnetometer[6] Additionally: gyroscope
Operating system iOS 5.1.1 iOS 6.1[116]
Battery Built-in lithium-ion polymer battery;(10 hours (Wi-Fi), 9 hours (3G or LTE) browsing; 10 hours video;[6] 140 hours audio;[117] 1 month standby[118])
Weight Wi-Fi model: 1.5 lb (680 g)
3G model: 1.6 lb (730 g)
Wi-Fi model: 1.325 lb (601 g)
GSM 3G (AT&T) model: 1.351 lb (613 g)
CDMA 3G (Verizon) model: 1.338 lb (607 g)
Wi-Fi model: 1.44 lb (650 g)
LTE model: 1.46 lb (660 g)
Wi-Fi model: 0.68 lb (310 g)
LTE model: 0.69 lb (310 g)
Dimensions 9.56×7.47×0.528 in (243×190×13.4 mm)[6][119] 9.5×7.31×0.346 in (240×186×8.8 mm)[119] 9.5×7.31×0.37 in (240×186×9.4 mm) 7.87×5.3×0.28 in (200×130×7.1 mm)
Mechanical keys Home, sleep, volume rocker, variable function switch (originally screen rotation lock, mute in iOS 4.2, either in 4.3 and later)[6]
Camera Back N/A 720 p HD still and video camera
0.7 MP, 30fps and 5× digital zoom
1080p HD still and video camera
5 MP, 30fps and 5× digital zoom
Front N/A VGA-quality still and videocamera, 0.3 MP 1.2 MP still, 720p video
Greenhouse gas emissions 130 kg CO2e[120] 105 kg CO2e[121] 180 kg CO2e[122] 170 kg CO2e[123] 95 kg CO2e[124]

The iPad is assembled by Foxconn, which also manufactures Apple’s iPod, iPhone and Mac Mini, in its largest plant in Shenzhen, China.[125] In April 2011, Foxconn announced that it would be moving production of the iPad and other Apple products to Brazil where it could begin production before the end of 2011.[126]

iSuppli estimated that each first-generation iPad 16 GB Wi-Fi version costs US$259.60 to manufacture, a total that excludes research, development, licensing, royalty and patent costs.[127] Apple does not disclose the makers of iPad components, but teardown reports and analysis from industry insiders indicate that various parts and their suppliers include:

Restrictions

Digital rights management

For more details on the digital rights management restrictions, see iOS.

The iPad does not employ Digital Rights Management but the OS prevents users from copying or transferring certain content outside of Apple’s platform without authorization, such as TV shows, movies, and apps. Also, the iPad’s development model requires anyone creating an app for the iPad to sign anon-disclosure agreement and pay for a developer subscription. Critics argue Apple’s centralized app approval process and control of the platform itself could stifle software innovation. Of particular concern to digital rights advocates is Apple’s ability to remotely disable or delete apps on any iPad at any time.[137][138][139]

Digital rights advocates, including the Free Software Foundation,[140] Electronic Frontier Foundation,[139] and computer engineer and activist Brewster Kahle,[citation needed] have criticized the iPad for its digital rights restrictions. In April 2010, Paul Sweeting, an analyst with GigaOM, was quoted by National Public Radio as saying, “With the iPad, you have the anti-Internet in your hands. … It offers [the major media companies] the opportunity to essentially re-create the old business model, wherein they are pushing content to you on their terms rather than you going out and finding content, or a search engine discovering content for you.” But Sweeting also thought that the limitations imposed by Apple impart the feeling of a safe neighborhood, saying, “Apple is offering you a gated community where there’s a guard at the gate, and there’s probably maid service, too.” Laura Sydell, the article’s author, concludes, “As more consumers have fears about security on the Internet, viruses and malware, they may be happy to opt for Apple’s gated community.”[141]

Jailbreaking

For more details on iPad Jailbreaking, see iOS jailbreaking.

Like certain iOS devices, the iPad can be “jailbroken”, depending on which version of iOS it is running, thus allowing applications and programs that are not authorized by Apple to run on the device.[142][143] Once it is jailbroken, users are able to download many applications previously unavailable through the App Store via unofficial installers such as Cydia, as well as illegally pirated applications.[143] Apple claims jailbreaking voids the factory warranty on the device in the United States even though jailbreaking is legal.[143][144] The iPad, released in April 2010, was first jailbroken in May 2010 with the Spiritjailbreak for iOS version 3.1.2.[145] The iPad can be jailbroken on iOS versions 4.3 through 4.3.3 with the web-based tool JailbreakMe 3.0 (released in July 2011),[146] and on iOS versions including 5.0 and 5.0.1 using redsn0w[147] Absinthe 2.0 was released on May 25, 2012 as the first jailbreak method for all iOS 5.1.1 devices except the 32 nm version of the iPad 2.[148]

Censorship

Apple’s App Store, which provides iPhone and iPad applications, imposes censorship of content, which has become an issue for book publishers and magazines seeking to use the platform. The Guardian newspaper described the role of Apple as analogous to that of British magazine distributor WH Smith, which for many years imposed content restrictions.[149]

Due to the exclusion of pornography from the App Store, YouPorn and others changed their video format from Flash to H.264 and HTML5 specifically for the iPad.[150] In an e-mail exchange[151] with Ryan Tate from Valleywag, Steve Jobs claimed that the iPad offers “freedom from porn”, leading to many upset replies including Adbustings in Berlin by artist Johannes P. Osterhoff[152] and in San Francisco during WWDC10.[153]

Reception

On May 28, 2010, the iPad was released in Australia, Canada, and Japan, as well as in several larger European countries. Media reaction to the launch was mixed. The media noted the positive response from fans of the device, with thousands of people queued on the first day of sale in a number of these countries.[154][155]

Reaction to the announcement

Media reaction to the iPad announcement was mixed. Walter Mossberg wrote, “It’s about the software, stupid”, meaning hardware features and build are less important to the iPad’s success than software and user interface, his first impressions of which were largely positive. Mossberg also called the price “modest” for a device of its capabilities, and praised the ten-hour battery life.[156] Others, including PC Advisor and the Sydney Morning Herald, wrote that the iPad would also compete with proliferating netbooks, most of which use Microsoft Windows.[157][158] The base model’s $499 price was lower than pre-release estimates by the tech press, Wall Street analysts, and Apple’s competitors, all of whom were expecting a much higher entry price point.[159][160][161]

CNET also criticized the iPad for its apparent lack of wireless sync which other portable devices such as Microsoft’s Zune have had for a number of years. The built-in iTunes app is able to download from the Internet as well.[162]

Reviews

Reviews of the iPad have been generally favorable. Walt Mossberg of The Wall Street Journal called it a “pretty close” laptop killer.[163] David Pogue of The New York Times wrote a “dual” review, one part for technology-minded people, and the other part for non-technology-minded people. In the former section, he notes that a laptop offers more features for a cheaper price than the iPad. In his review for the latter audience, however, he claims that if his readers like the concept of the device and can understand what its intended uses are, then they will enjoy using the device.[164] PC Magazine’s Tim Gideon wrote, “you have yourself a winner” that “will undoubtedly be a driving force in shaping the emerging tablet landscape.”[165] Michael Arrington of TechCrunch said, “the iPad beats even my most optimistic expectations. This is a new category of device. But it also will replace laptops for many people.”[166] PC World criticized the iPad’s file sharing and printing abilities,[167] and ArsTechnica said sharing files with a computer is “one of our least favorite parts of the iPad experience.”[168]

The media also praised the quantity of applications, as well as the bookstore and other media applications.[169][170] In contrast they criticized the iPad for being a closed system and mentioned that the iPad faces competition from Android-based tablets.[154] However, the Android tablet OS, known as “Honeycomb”, is not open source and has fewer apps available for it than for the iPad.[171] The Independent criticized the iPad for not being as readable in bright light as paper but praised it for being able to store large quantities of books.[169] After its UK release, The Daily Telegraph said the iPad’s lack ofAdobe Flash support was “annoying.”[172]

Recognition

The iPad was selected by Time Magazine as one of the 50 Best Inventions of the Year 2010,[173] while Popular Science chose it as the top gadget[174]behind the overall “Best of What’s New 2010″ winner Groasis Waterboxx.[175]

Usage

Business

While the iPad is mostly used by consumers it also has been taken up by business users.[176] Within 90 days of its release, the iPad managed to penetrate 50% of Fortune 100 companies.[177] Some companies are adopting iPads in their business offices by distributing or making available iPads to employees. Examples of uses in the workplace include attorneys responding to clients, medical professionals accessing health records during patient exams, and managers approving employee requests.[178][179][180]

A survey by Frost & Sullivan shows that iPad usage in office workplaces is linked to the goals of increased employee productivity, reduced paperwork, and increased revenue. The research firm estimates that “The mobile-office application market in North America may reach $6.85 billion in 2015, up from an estimated $1.76 billion [in 2010].”[181]

Since March 2011, the US Federal Aviation Administration has approved the iPad for in-cockpit use to cut down on the paper consumption in several airlines.[182] In 2011, Alaska Airlines became the first airline to replace pilots’ paper manuals with iPads, weighing 0.68 kg compared to 11 kg for the printed flight manuals. It hopes to have fewer back and muscle injuries.[183] More than a dozen airlines have followed suit, including United, which has distributed 11,000 iPads to cockpits.[184] Also, many airlines now offer their inflight magazine as a downloadable application for the iPad.[185][186][187]

Education and healthcare

The iPad has several uses in the classroom,[188] and has been praised as a valuable tool for homeschooling.[189][190] Soon after the iPad was released, it was reported that 81% of the top book apps were for children.[191] The iPad has also been called a revolutionary tool to help children with autism learn how to communicate and socialize more easily.[192]

In the healthcare field, iPads and iPhones have been used to help hospitals manage their supply chain. For example, Novation, a healthcare contracting services company, developed VHA PriceLynx (based on the mobile application platform of business intelligence software vendor MicroStrategy), abusiness intelligence app to help health care organizations manage its purchasing procedures more efficiently and save money for hospitals. Guillermo Ramas of Novation states, “Doctors won’t walk around a hospital with a laptop. With an iPad it’s perfect to walk around the hospital with as long as they have the information they need.”[193]

Consumer usage

During the 2010 Major League Baseball free agent season, the agent for the player Carl Crawford was sending iPads to prospective teams interested in Mr. Crawford. These iPads were pre-loaded with video clips highlighting his player, and how it would benefit their team to have him.[194]

In the United States fans attending Super Bowl XLV, the first Super Bowl since the iPad was released, could use an official National Football League (NFL) app to navigate Cowboys Stadium.[195] In 2011, the Tampa Bay Buccaneers became the first NFL club to discontinue the use of paper copies of playbooks, and instead distributed all players their playbook and videos in electronic format via an iPad 2.[196]

The iPad is able to support many music creation applications in addition to the iTunes music playback software. These include sound samplers, guitar and voice effects processors, sequencers for synthesized sounds and sampled loops, virtual synthesizers and drum machines, theremin-style and other touch responsive instruments, drum pads and many more. Gorillaz‘s 2010 album, The Fall, was created almost exclusively using the iPad by Damon Albarn while on tour with the band.[197]

The iPad has also greatly increased social television use. Viewers can use the iPad as a convenient second networked computer (or “second screen“) for communicating with other viewers or with the television provider. Viewers can use a web browser or specialised applications to discuss a program with other viewers, while it is being broadcast, while content providers may use the second screen to interact with viewers in real time. The latter facility allows content providers to conduct (e.g.) real-time polls or to collect comments about the program, that can be displayed as text on the main television screen. Viewer interaction via a second screen is becoming increasingly popular.[198]

Timeline

Source: Apple press release library[199
Page semi-protected
iPad
An image of the second, third and fourth generation iPad
The third-generation iPad.
Developer Apple Inc.
Manufacturer Foxconn (on contract[1])
Type Tablet computer
Release date 1st generation:
April 3, 2010 (Wi-Fi)[2][3]
April 30, 2010 (Wi-Fi + 3G)[4]
May 28, 2010 (International)
2nd generation:
March 11, 2011 (United States)
March 25, 2011 (International)
3rd generation:
March 16, 2012
4th generation and Mini:
November 2, 2012
Units sold 100 million[5]
Operating system iOS 6.1
Power Built-in rechargeable Li-Po battery
25 W·h (90 kJ), 10hr life[6]
System-on-chip used 1st generationApple A4
2nd generationApple A5
3rd generationApple A5X
4th generationApple A6X
MiniApple A5
CPU 1st generation:
1 GHz ARM Cortex-A8[6][7]
2nd generation:
1 GHz dual-core ARM Cortex-A9
3rd generation:
1 GHz dual-core ARM Cortex-A9
4th generation:
1.4 GHz dual-core Apple Swift
Mini:
1 GHz dual-core ARM Cortex-A9
Storage capacity 16, 32, 64, or 128 GB flash memory[6][8]
Memory 1st generation:
256 MB DDR RAM[9]
2nd generation:
512 MB DDR2 RAM[10]
3rd & 4th generation:
1024 MB DDR2[11]
Mini:
512 MB DDR2 RAM
Display 1st & 2nd generation:
1024 × 768 px 132 PPI 4:3aspect ratio
9.7 in (250 mm) diagonal
XGALED-backlit IPS LCD[6]
3rd & 4th generation:
2048×1536 px 264 PPI
Mini
1,024×768 px 163 PPI
7.9 in (200 mm) diagonal
Graphics 1st generation
PowerVR SGX535[12]
2nd generation
PowerVR SGX543MP2[13]
3rd generation
PowerVR SGX543MP4
4th generation
PowerVR PowerVR#Series SGX554MP4
Mini
PowerVR PowerVR#Series SGX543MP2
Input Multi-touch screenheadset controlsproximity and ambient light sensors, 3-axisaccelerometerdigital compass
2nd generation adds: 3-axisgyro
Camera 1st generation: None
2nd generation: VGA Front-facing and 720p rear-facing
3rd generation: VGA Front-facing and 5 million pixels rear-facing
4th generation and mini720pFront-facing and 5 million pixels rear-facing
Connectivity
Wi-Fi 
802.11 a/b/g/n

1st & 2nd Generation
Bluetooth 2.1 + EDR

GSM models also include
UMTS / HSDPA
850, 1,900, 2,100 MHz

 

 

GSM /EDGE

850, 900, 1,800, 1,900 MHz

 

CDMA model also includes
CDMA/EV-DO Rev. A
800, 1,900 MHz

3rd Generation
Bluetooth 4.0 technology

GSM models also include
LTE 
700, 2,100 MHz

 

 

UMTS /HSDPA/HSPA+ / DC-HSDPA

850, 900, 1,900, 2,100 MHz

 

GSM / EDGE

850, 900, 1,800, 1,900 MHz

 

CDMA model also includes
LTE 
700 MHz

 

CDMA/EV-DO Rev. A
800, 1,900 MHz

 

 

UMTS /HSDPA/HSPA+/DC-HSDPA

850, 900, 1,900, 2,100 MHz

 

GSM / EDGE

850, 900, 1,800, 1,900 MHz
Online services iTunes StoreApp StoreiCloud,iBookstore
Dimensions 1st generation:9.56 in (243 mm) (h)
7.47 in (190 mm) (w)
0.50 in (13 mm) (d)
2nd generation:
9.50 in (241 mm) (h)
7.31 in (186 mm) (w)
0.34 in (8.6 mm) (d)
3rd & 4th generation:
9.50 in (241 mm) (h)
7.31 in (186 mm) (w)
0.37 in (9.4 mm) (d)
Mini:
7.87 in (200 mm) (h)
5.3 in (130 mm) (w)
0.28 in (7.1 mm) (d)
Weight Wi-Fi model: 1.5 lb (680 g)
Wi-Fi + 3G model: 1.6 lb (730 g)[6]
2nd generation: 1.325 lb (601 g)
3rd generation Wi-Fi model:1.44 lb (650 g)
3rd generation Wi-Fi + 4G model: 1.46 lb (660 g)
4th generation Wi-Fi model:1.44 lb (650 g)
4th generation LTE model:1.46 lb (660 g)
Mini Wi-Fi model: 0.68 lb (310 g)
Mini LTE model: 0.69 lb (310 g)
Related articles iPhoneiPod Touch(Comparison)
Website apple.com/ipad
This article is part of a series on the
iPad
1st generation
iPad 2
3rd generation
4th generation
Mini
List of iPad models