Ultrabay Slim Combo II - no DMA

[ZPrime]

I just bought a Combo2 so I could have 24x burning. XP refuses to enable DMA on it. I've tried the usual trick of uninstalling the CD drive in device manager, but that's about it. I can't find any firmware updates - it claims to be on 1.71.

Laptop is a spankin new T42p - 2379-EZU, latest BIOS/embedded controller versions already applied.

Any ideas?

Nevermind. Fixed!

Found a good answer here.

The short version: search for the text "MasterIdDataChecksum" or "SlaveIdDataChecksum". Find the instance that is under "CurrentControlSet" and associated with the IDE channel for your drive (Primary or Secondary channel, you'll see the values on the right-hand side). Delete the "Checksum" key for the channel and position of the problem drive. Mine was secondary master, so that's what I killed.

After a restart, all was well again with the drive. I'd delete this post, but since I can't I figured I'd make it valuable instead.