Definitions for "Rewritable"
CD disk which can be erased and written on again.
Rewritable drives can erase recorded data and rewrite an update file in its original sector location
Media that can be written to, erased, and written to again. Up to 1,000 times with CD-RW, DVD-RW, and DVD+RW and up to 100,000 times for DVD-RAM (numbers refer to amount of times while media is in protective cartridges; the rewrite rating drops drastically without the casing).
Storage medium that can be overwritten multiple times, normally without pre-erasure.