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iPod Touch
4th generation iPod Touch
DeveloperApple Inc.
TypePortable media player/PDA/Handheld game console/Mobile Internet device/Digital audio player/E-book reader/Camcorder/Webcam/Digital Camera
Lifespan 1st generation: September 13, 2007
2nd generation: September 9, 2008
3rd generation: September 9, 2009
4th generation: September 8, 2010
5th generation: Unknown
Operating systemiOS
1st generation: 3.1.3 (1.1 originally)
2nd generation: 4.2.1 (2.1.1 originally)
3rd generation: 4.3.4 (3.1.1 originally)
4th generation: 4.3.4 (4.1 originally)
CPU1st generation:

ARM11 620 MHz (underclocked to 400 MHz, then 412 MHz)
2nd generation:
ARM11 620 MHz (underclocked to 533 MHz), without internal ARM7 core for Jazelle acceleration
3rd generation:
ARM Cortex-A8 833 MHz (underclocked to 600 MHz)
4th generation:
ARM Cortex-A8 Apple A4 1 GHz (underclocked to 800 MHz)

*Note: All iPods are underclocked by 200MHz
Memory

1st/2nd generation: 128 MB DRAM

3rd/4th generation: 256 MB DRAM
Storage

1st/2nd generation: 8, 16 and 32 GB Flash memory
3rd generation: 8, 32 and 64 GB Flash memory

4th generation: 8, 32 and 64 GB Flash memory
Display

1st–3rd generations: 3.5 in (89 mm), 3:2 aspect ratio, 18-bit color depth LCD, 320×480 px at 163 ppi

4th generation: 3.5 in (89 mm), 3:2 aspect ratio, 24-bit color depth, aluminosilicate glass-covered LED-backlit LCD, 960×640 px at 326 ppi
Graphics

1st/2nd generation: PowerVR MBX Lite

3rd/4th generation: PowerVR SGX
Input
CameraFront: Video recording, VGA up to 30 frame/s with audio, VGA-quality still camera, 0.3 MP (4th generation) Back: Video recording, 1280×720 up to 30 frame/s with audio, 960×720 still camera with 5x digital zoom, 0.7 MP (4th generation)
Connectivity
Power3.7 V rechargeable Lithium-ion battery

1st generation:
Audio – 22 hours, Video – 5 hours
2nd generation:
2.92 Wh, 789 mAh; Audio – 36 hours, Video – 6 hours
3rd generation:
2.92 Wh, 789 mAh; Audio – 30 hours, Video – 6 hours
4th generation:

3.44 Wh, 930 mAh; Audio – 40 hours, Video – 7 hours
Dimensions1st generation:

4.3 in (110 mm) × 2.4 in (61 mm) × 0.31 in (7.9 mm) (H×W×D)
2nd/3rd generation:
4.3 in (110 mm) × 2.4 in (61 mm) × 0.33 in (8.4 mm) (H×W×D)
4th generation:
4.4 in (110 mm) × 2.3 in (58 mm) × 0.28 in (7.1 mm) (H×W×D)

5th generation: Unknown
Weight 1st generation: 120 g (4.2 oz)
2nd/3rd generation: 115 g (4.1 oz)
4th generation: 101 g (3.6 oz)
RelatediPhone, iPad (List of iOS devices)

The iPod Touch (stylized and marketed as lowercase iPod touch; also colloquially referred to as the iTouch, by analogy to the iPhone) is a portable media player, personal digital assistant, Handheld game console, and Wi-Fi mobile platform designed and marketed by Apple Inc. The iPod Touch adds the multi-touch graphical user interface to the iPod line. It is the first iPod with wireless access to the iTunes Store, and also has access to Apple's App Store, enabling content to be purchased and downloaded directly on the device. As of March 2011, Apple Inc. has sold over 60 million iPod Touch units.

Software

iOS, the operating system that runs on the iPod Touch, has generally received a major update each year in June. iOS was formerly called iPhone OS, until the release of version 4.0. The first major update after the initial release was iPhone OS 2.0. This update introduced the App Store, which allowed third-party applications for the first time. iPhone OS 2.0 debuted June 29, 2008. iPhone users received the update for free, while iPod Touch users had to pay for the update. The second major update to the operating system, iPhone OS 3.0, was released June 17, 2009. iPhone OS 3.0 added features such as cut, copy, and paste; data tethering; and push notification support. As with the previous major release, iPhone users received the update for free, while iPod Touch users had to pay for the update. iOS 4.0 was made available to the public on June 21, 2010. It was the first major iOS release to drop support for some devices; the first generation iPod Touch and original iPhone are not supported in iOS 4.0. The iPhone 3G and second generation iPod Touch had limited functionality under iOS 4.0, while the iPhone 4, iPhone 3GS, third generation iPod Touch, and fourth generation iPod Touch had full functionality under iOS 4.0. The major features introduced in iOS 4.0 included iBooks, FaceTime, and multitasking. iOS 5.0 was previewed to the public on June 6, 2011, and is expected to be released in the fall of 2011.

Apple has received criticism for charging iPod Touch owners for major iOS updates that iPhone owners receive for free, as well as excluding certain features from the iPod Touch software that are included in the iPhone. Apple has said that they can add features for free to the iPhone because the revenue from it is accounted for on a subscription basis under accounting rules, rather than as a one time payment. At WWDC in June 2010, Jobs announced that Apple had "found a way" to make subsequent OS upgrades available free to iPod Touch owners. However, iOS 4.0 and onwards isn't available for the first generation iPod Touch, and some features are only available for the 32GB and 64GB third generation iPod Touch released in September 2009 and the fourth generation iPod Touch released in 2010.

In June 2011, iOS 5, the fifth major release of iOS software, was announced at Apple's WWDC 2011. iOS 5 is expected to be publicly released sometime during the Fall of 2011, and will be available on the iPhone 3GS, iPhone 4 (GSM & CDMA versions), iPod touch (3rd & 4th generations), iPad, and iPad 2. Some of its new features include Notification Center, iMessage, Newsstand, Reminders, and Twitter integration. In addition, iOS 5 will come bundled with iCloud.

Comparison to the iPhone

Main article: List of iOS devices See also: iOS (Apple) and iOS version history

The iPod touch and the iPhone share essentially the same hardware and run the same iOS operating system. The iPod touch lacks some of the iPhone's features and associated apps, such as access to cellular networks, GPS navigation (and speaker on older models). Although the SMS and Phone apps are included on the iPod touch software, they are disabled and therefore not visible. Also, the sleep/wake button was on the opposite side, up until the release of the iPod touch 4th generation. As a result, the iPod touch is slimmer and lighter than the iPhone. Steve Jobs once referred to the iPod touch as "training wheels for the iPhone".

Another major difference is the quality of the back camera compared to the iPhone. The iPod Touch camera has a lower resolution due to the device’s thin case and price compared to the iPhone.

Requirements

  • iTunes 10 or later
  • Mac OS 10.5 or later
  • Windows XP Home or Professional with Service Pack 3 or later

Synchronization

As supplied new, the iPod Touch must be connected to a Macintosh or Windows computer. There is no official Linux support. On either OS, the iPod Touch must be connected through a USB port. This will charge the iPod Touch and sync music, videos, pictures and more. Special cables that plug into a wall can also be bought separately but can only be used to charge the iPod Touch.

The first time the iPod Touch is turned on, a graphic of the iTunes logo and USB cable is displayed continuously until the iPod Touch is connected to a computer running iTunes. It is not manageable by Mac OS X 10.4 Tiger.

Battery charging

Starting with the second generation, iPod Touch can only be charged from the 5 V pin of the dock connector while most previous iPod models (including the original iPod Touch) could also be charged from the 12 V pin for FireWire power. This change dropped support for charging in vehicles equipped with a FireWire-based iPod connection. Most aftermarket manufacturers of such equipment offer cables and/or adapters which convert the vehicle's 12 V to 5 V.

iTunes

To use the iPod Touch for purchasing content on the iTunes Store via Wi-Fi, a new or existing iTunes Store account (Apple ID) must be associated. Apple states that the following are required for the iPod Touch:

  • iTunes 10.2.1 for iOS 4.3 or later, iTunes 10 for iOS 4.1 or later, iTunes 9.2.0.61 for iOS 4.0.x or later, iTunes 8.2 for iPhone OS 3.0.x or later, iTunes 8.0 for iPhone OS 2.1.x, iTunes 7.6 for iPhone OS 2.0.x or earlier
  • An available USB 2.0 port

Third-party applications

Earphones with an external microphone and controller are compatible with the 2nd generation iPod Touch, and are shipped with the 3rd generation iPod Touch devices (excluding the 8GB model).

The only official way to obtain third-party applications for the iPod Touch is Apple's App Store, which is a branch of iTunes Store. The App Store application, available in all versions of iOS from 2.0 onwards, allows users to browse and download applications from a single online repository (hosted by Apple) with the iTunes Store. To develop such software, a software development kit (SDK) was officially announced on March 6, 2008, at an Apple Town Hall meeting. The iPhone SDK allows developers to make applications for the iPhone and iPod Touch after paying a fee to join the development team. The developer can then set the price for the applications they develop and will receive 70% of money earned. Apple retains 30% of the sale price with no minimum fixed fee.

Hacks

Shortly after the iPhone (then also the iPod touch) was released, hackers were able to "jailbreak" the device through a TIFF exploit. The application installed by this exploit enabled the user to download a selection of unofficial third-party programs. Jailbreaking the iPod Touch was the only way to get third-party programs when running 1.1.x OSes. These third-party programs could use additional functionality not supported by Apple (such as enabling multitasking, applying themes to the home screen, or enabling a battery percentage indicator). All officially released versions of iOS through 3.1.2 though 4.3.3 with some bugs, can be jailbroken, but version 4.3.1 could not at the time it was released. Recently, the 4.3.X firmware has been jailbroken untethered by @i0nic. Servicing an iPod Touch after jailbreaking or other modifications made by unofficial means is not covered by Apple's warranty (however, the jailbreaking process is easily undone by performing a restore through iTunes). Today every firmware of the iPod touch can be jailbroken from 1.1.1 to 4.3.3 and even 5.0b2.

On July 7, 2011, Apple announced that in new versions of the iOS software, a security problem would be fixed. Users who install their own software without Apple's protections can have their information stolen or unwitttingly download malware by clicking on certain PDF files. This discovery of "critical weaknesses" was made by the German Federal Office for Information Security.

Specifications

Legend
Discontinued Current
Model 1st generation 2nd generation 3rd generation 4th generation
Initial operating system iOS 1.1 iOS 2.1.1
iOS 3.1.1 (3G 8 GB MC model) 		iOS 3.1.1 iOS 4.1
Highest Supported operating system iOS 3.1.3 iOS 4.2.1 iOS 4.3.4

iOS 5.0 (beta versions)

Display 3.5 in (89 mm); 2:3 aspect ratio, 262,144-color,

glossy glass-covered LED-backlit LCD screen, 320x480 px (HVGA) at 163 ppi

3.5 in (89 mm); 2:3 aspect ratio; 24-bit color, glossy glass-covered LED-backlit LCD, 960×640 px at 326 ppi
System on Chip Samsung S5L8900 Samsung S5L8720 Samsung S5L8920 Apple A4 (Samsung S5L8930)
CPU Core 620 MHz (downclocked to 412 MHz, originally 400 MHz)
ARM 1176JZ(F)-S 		620 MHz (downclocked to 533 MHz)
ARM 1176JZ(F)-S 		833 MHz (downclocked to 600 MHz)
ARM Cortex-A8 core 		1 GHz (downclocked to 800 MHz)
ARM Cortex-A8
GPU Core PowerVR MBX Lite GPU PowerVR SGX535 GPU
Storage 8, 16 and 32 GB 32 and 64 GB 8, 32 and 64 GB
Memory 128 MB DRAM 256 MB DRAM
Connectivity Wi-Fi (802.11b/g),
USB 2.0/Dock connector 		In addition to previous:
Bluetooth 2.1 + EDR (requires iPhone OS 3.0),
Built-in speaker, Hardware volume controls, Nike+ 		In addition to previous:
Voice Control,
Includes earphones with remote and mic 		In addition to previous:
802.11n (2.4 GHz only)
3-axis gyroscope
Microphone
Cameras — Back (main): CMOS image sensor with video (720p HD at 30 frame/s);
Front: VGA-quality photos and video at up to 30 frame/s.
Audio processor Wolfson Microelectronics WM8758BG Cirrus Logic CS4398 Cirrus Logic CS4398 Cirrus Logic
Materials Glass display, stainless steel back and aluminum bezel; plastic for Wi-Fi antenna Glass display, contoured stainless steel back and bezel; plastic for Wi-Fi and Bluetooth antenna Glass display, stainless steel back and bezel
Power Built-in rechargeable lithium-ion polymer battery
3.7 V 2.15 W·h (580 mA·h) 3.7 V 2.73 W·h (739 mA·h) 3.7 V 2.92 W·h (789 mA·h) 3.7 V 3.44 W·h (930 mA·h)
Rated battery life (hours) audio: 22
video: 5 		audio: 36
video: 6 		audio: 30
video: 6 		audio: 40
video: 7
Dimensions 110 × 61.8 × 8 mm (4.3 × 2.4 × 0.31 in) 110 × 61.8 × 8.5 mm (4.3 × 2.4 × 0.33 in) 111 × 58.9 × 7.2 mm (4.4 × 2.3 × 0.28 in)
Weight 120 g (4.2 oz) 115 g (4.05 oz) 101 g (3.6 oz)
Released 8 and 16 GB: September 14, 2007
32 GB: February 5, 2008 		September 9, 2008 September 9, 2009 September 1, 2010
Discontinued September 9, 2008 16 and 32 GB: September 9, 2009
8 GB: September 1, 2010 		September 12, 2010 In Production

See also

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References

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