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In the history of optical storage media there have been and there are different optical disc formats with different data writing/reading speeds.. 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.
It was resolved with both surviving however: DVD-R predominating for stand-alone DVD recorders and players, and (for computers) most DVD devices being engineered as dual format, to be compatible with both. As of 2007 DVD is the de facto standard for pre-recorded movies, and popular storage of data beyond the capacity of CD.
[specify] It allows for shorter access times because the rotation speed (angular velocity) does not need to be changed when the laser seeks across the disc, similarly to the magnetic head of a hard disk drive. With a given angular (rotation) speed, the linear speed at the outermost track is nearly 2.4 times as fast as that of the innermost track.
This category has the following 6 subcategories, out of 6 total. B. ... Pages in category "Hardware DVD players" The following 7 pages are in this category, out of 7 ...
Portable DVD players generally have connections for additional screens and a car lighter plug. Some PDPs had iPod docks, USB and SD card slots built in. Some can play videos in other formats such as MP4, DivX, either from CDs, flash memory cards or USB external hard disks, and some DVD players had a USB video recorder.
The recording speed on such drives was rated in multiples of 150 KiB/s; a 4X drive, for instance, would write steadily at around 600 KiB/s. The transfer rate was kept constant by having the spindle motor in the drive vary in speed and run 2.4 times [ 1 ] as fast when recording at the inner rim of the disc as on the outer rim.
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