rewritable
Used in computing contexts for storage media that can be written to multiple times, such as rewritable CDs or magneto-optical discs.
This disc is rewritable.
書き込み可能 means 'writable' and is more general, while 書き換え可能 specifically means 'rewritable', implying the ability to overwrite existing data.
Compound of 書き換え (rewriting) + 可能 (possible).