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The Universal Media Disc (UMD) is a discontinued optical disc medium developed by Sony for use on its PlayStation Portable handheld gaming and multimedia platform. It can hold up to 1.8 gigabytes of data and is capable of storing video games, feature-length films, and music.
MD Data disks can be fully read-only, fully rewritable, or be a hybrid of the two, with a portion of a disk being read-only and while another is rewritable. With 140 MB disks, MD Data offered about 100 times as much storage capacity as ordinary diskettes, and more than its competitors like the Zip (100 MB), SuperDisk (120 MB), and EZ 135 (135 ...
The MiniDisc had flimsy plastic protection just like UMD's and the Discs both held side to side look and measure the same (almost like holding up a regular cd up against a regular dvd). —Preceding unsigned comment added by 69.228.116.112 ( talk ) 22:07, 24 March 2008 (UTC) [ reply ]
Hi-MD is a magneto-optical disc-based data storage format. It was a further development of the MiniDisc . [ 1 ] With its release in late 2004, [ 2 ] came the ability to use newly developed, high-capacity 1 gigabyte Hi-MD discs, in the same dimensions as MiniDisc. [ 2 ]
The PlayStation Portable, UMD disc is a similar concept, using a small proprietary DVD-type disc, in a fixed unopenable caddy as both a copy protection and damage prevention measure. The MiniDisc is a similar concept again, using a small proprietary Magneto-optical type disc instead, also in a fixed unopenable caddy.
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Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), [1] the same speed of compact disc players without buffering. As faster drives were released, the write speeds and read speeds for optical discs were multiplied by manufacturers, far exceeding the drive speeds originally released onto the market.
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