I am an IT guy and I will tell you it's not worth it at all. With the cost of regular blank CD it makes no sense to even use rewritable. Buying CDs in bulk by a hundred they come out to about 20c and at that time they do become totaly disposable. Erasing and rewriting optical media take F O R E V E R... and after three or four uses becomes totaly unreliable.

The best bet is to install on the new DVD/CD drives around $50.00 and just use regular blank CDs. If you have larger chunk of data then buy a few blank DVD's and use them.

Oh and by the way. You do not need to fill the disk up at one time. You can keep adding files as you need as long as you have disk space left...