There is nothing wrong with that...but the 100 bus will only operate at the speed of the CD & that goes for other devices on that same bus....In the future you need motherboards with you 100bus & reg bus for your other hardware... Steve >>> [log in to unmask] 12/20/01 08:47AM >>> We were assembling some PCs and realized that the Mobo came with only one IDE cable, ATA 100. As we had to install a CD drver we put the HDD as MAster and the CD driver as slave in the same ATA 100 bus. Anything wrong with it? TIA Roberto Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com