Yes there is a limit to how many times you can rewrite a CD or DVD RW disc. No, it's not a specific number like 10, or 20. It depends alot on the quality and the age of the disc.

Toshiba Brings World’s First Slim HD DVD Rewritable Drive to Mobile PCs; New HD DVD Rewrite Capabilities Turn Mobile PCs into Desktop Replacements with More Tools to Create High-Definition Content ...

TORONTO – Hewlett Packard has up the ante in the DVD arena with the launch of a new writeable DVD drive, called the HP DVD-writer dvd100i. It can create and rewrite DVD disks as well as CDs. The ...

The ZL40510 and ZL40511 debut as the industry's first laser-diode drivers to support optical disk drives with x16 DVD and x52 CD write/rewrite speeds. According to the company, the drivers will allow ...