DVD-RW (Digital Versatile Disc - Re-recordable)
A version of the write-once DVD-R format that can be written to up to 1,000 times. The Pioneer DVR-A05U drives can record on single-sided 4.7GB DVD-RW discs. DVD-RW discs can be accessed in set top DVD players and computers equipped with DVD-ROM drives.
Theoretically maybe a thousand times, but... I wouldn't trust even a well-made DVD-RW past maybe 50-100 complete writes. That's a stretch, I wouldn't trust it past maybe 20 if the data was really important.