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DVD-RW (formerly DVD-R/W and also briefly known as DVD-ER) is a
phase-change erasable format. Developed by Pioneer based on DVD-R,
using similar track pitch, mark length, and rotation control, DVD-RW
is playable in many DVD drives and players. (Some drives and
players are confused by DVD-RW media's lower reflectivity into
thinking it's a dual-layer disc. In other cases the drive or
player doesn't recognize the disc format code and doesn't even try
to read the disc. Simple firmware upgrades can solve both
problems.) DVD-RW uses groove recording with address info on land
areas for synchronization at write time (land data is ignored
during reading). Capacity is 4.7 billion bytes. DVD-RW discs can
be rewritten about 1,000 times.
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