In addition to PS2 software, the PS2 can read both CDs and DVDs and is backward compatible with PlayStation games. The ability to play DVD movies was an added incentive for consumers to be able to justify purchasing the PS2 (the MSRP was US$300 in October 2000). The PS2 also supports PlayStation memory cards (for PlayStation game saves only) and controllers, although the memory cards only work with PS1 games and the controllers may not support all functions (such as analog buttons) for PS2 games.
The PS2's DualShock 2 controller is essentially an upgraded PlayStation DualShock; analog face, shoulder and D-pad buttons replaced the digital buttons of the original. Like its predecessor, the DualShock 2 controller has force feedback, which is commonly called the "vibration" function. The standard PlayStation 2 memory card has an 8MB capacity and uses Sony's Magicgate encryption. This requirement prevented the production of memory cards by third parties who did not purchase a license for the Magicgate encryption. The memory card can store PlayStation game saves, but PlayStation games cannot read from or write to the card - it can only be used as a backup.
The console also features USB and IEEE 1394 expansion ports. Compatibility with USB and IEEE 1394 devices is dependent on the software supporting the device. For example, the PS2 BIOS will not boot an ISO image from a USB flash drive or operate a USB printer, as the machine's operating system does not include this functionality. By contrast, Gran Turismo 4 is programmed to save screenshots to a USB mass storage device and print images on certain USB printers. A PlayStation 2 HDD can be installed in an expansion bay on the back of the console, with some exceptions.
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