In a similar vein to the launch of the iPhone, Apple has left features out of the iPad in order to force customers to hand over more money for accessories and, eventually, the next generation of the device.
The iPad lacks a built-in camera, USB ports and memory card reader, but all three features can be added by buying separate adapters. A separate keyboard dock is required to connect the iPad to a keyboard.
"Are we really going to have to carry a separate camera with us and connect it to the iPad to get it onto the internet?" wrote Mike Melanson on
ReadWriteWeb.com.
"And what about Skype, undoubtedly one of the favorites when it comes to keeping in touch with friends and family in far away places? Video chatting is out of the question."
The iPad is based on the same operating system as the iPhone, and they share the limitation of being unable to run multiple applications at the same time or to display web pages created using Adobe's Flash.
Also like the iPhone, the iPad can only run apps sanctioned by Apple and provided through its App Store.
Only videos contained in the user's iTunes library or converted to Apple's video formats will play, and files cannot be dragged and dropped on to the device, as is the case with most other computers.
It also lacks an HDMI output for connection to a TV set. Only 720p video playback is supported, rather than the 1080p resolution of true high-definition files.
Similarly, when the iPhone launched, it lacked the ability to search, copy and paste, record videos and send MMS messages, among other features, but these were all added later.
"The tablet's resolution tops out at 1024 x 768, which falls into the 4:3 standard definition range and not the glorious, widescreen 16:9 high definition aspect ratio we've come to know and love," wrote Barb Dybwad on the
Mashable blog.
There is no full GPS support either but the more expensive 3G models, set to be released a month after the standard models, support "assisted GPS", which pinpoint your location using nearby mobile towers.
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