DVD-R is a write-once format, meaning that data can be written to a disc and stored without fear of accidental erasure. similar.
DVD-R, like CD-R, uses a constant linear velocity ration technique to maximize the storage density on the disc surface.
This results in a variable number of revolutions per minute (RPM) as disc writing/reading progresses from one end to the other.
Recording begins at the inner radius and ends at the outer. At "1X"speeds, rotation of the disc varies from 1,623 to 632 RPM on 3.95 Gbyte media and 1,475 to 575 RPM on 4.7 byte media, depending on the record/playback head's position over the surface.
On 3.95 Gb media, the track pitch, or the distance from the center of one part of the spiral information "track" to an adjacent part of the track, is 0.8 microns, one-half that of CD-R. 4.7 Gbyte media uses an even smaller track pitch of 0.74 microns.
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