this cd-rw is a 24/10/40 speed cd-rw. everything was running fine til recently. About a week ago, the speeds dropped down to 4x max write speed and when it "burns" the cd there is no data on the disk after words. Also the cd-rw can erase a cd-rw disk, and reads other cds fine. I'm using Nero 6.6.0.13. Any ideas why the sudden drop in speed and no data being written?