Amdmb.com has posted an FAQ for the Abit KT7/KT7-RAID motherboards.
Why doesn´t my CD-ROM/DVD/ZIP/etc work on the HPT370?Read more
At Abit´s suggestion, only hard drives should be connected to IDE 3 and 4, and you should move all the ATAPI devices such as CDROMs/DVDs/ZIPs/LS120s, etc to the first two IDE channels. This will give you the best performance out of all of the devices in your machine.