Selling a DVD-ROM or a CD-ROM now a days will not give u a moneyback value. As i got iomega super dvd and a dvd-rom in my PC. I use the dvd-rom for browsing dvds and cds and for writting cds and dvds i use the iomega dvd writer.
I would suggest don't use scratched cds/dvds in your sony dvd writer. 1st of all SONY dvd-rw will hardly read it. If it does, the life of the lens will degrade.
So use it wisely.
I would also suggest, give the cd-rom to one of ur friend who doesn't got 1. You will get lots of thanks for your friend. Or if u want money, try selling it instead. your choice
peace