This may sound harsh, but...
1. Read data with Bad Copy Pro to safe place.
2. Try (full) formatting the rewritable and test the disk.
3. If errors still appear, trhow the disk into garbage bin and get new one!
Sometimes rewritables do fail and become unreliable.
It's not worth to use unreliable disks... unless your data is unimportant to you.
Why you insist using that faulty disk, instead of buying new one?
One new disk is hardly going to ruin your economy.
Then again, this is only my opinion... and there are rumours about me being wrong once in previous life.
