I personally don't use CDRW. If it's something I plan on altering, I keep it on hard drive. If it's something I plan to never alter (like downloaded props, etc.), then it goes on CDR. Plus, the last time I price checked, CDRs were going for less than $1 each, while CDRWs were going for $20 each. The definite price advantage goes to CDR, even if you have to burn a new one for updates every once in a while.