by Sonic, does exactly what you want it to do. It will create a drive letter for your re-writable cd-rom so that you can copy files, songs, pictures, etc onto the disk. It works pretty good, aside from its price.
Here is a link to the site so you can read up on its capabilities. Good luck.

http://www.sonic.com/products/recordnow/deluxe/default.asp

Ciao,
Bill Romano