What could be causing these messages to appear? My external HD is usb2 & my external NEC 2510a 8x burner is firewire, both connected via an Adaptec duoconnect card (2 usb2 & 2 firewire ports). When I just was using my internal HD, and my burner connected via my OLD card, which was a 3 port firewire card, everything was fine. But when i try to use both the external HD (for saving files to/from) and the burner through the new Adaptec card, I get those pesky error messages. 99% sychronising cache is displayed in Decrypter, and it just stays that way, like the program is not responding, and in fact, I have to use the task manager to close it down when that's happened. I get the following from DVDshrink whenever I try to burn an already saved file from either my internal or external HD to my external burner when attached through the firewire port on the Adaptec duoconnect card- I/O error: Device NEC DVD RW ND 2510a 2.15(E) CDB : 2A 00 00 00 11 40 00 00 10 00 Interpretation : Write(10) - Sectors 4416-4431 Reason : A device attached to the system is not functioning. Gosh, I sure hope someone out thereknows what I can do, or has at least heard of this kind of thing before, and can steer me in the right direction, as I haven't a clue what to do. Can anyone help?