MB is Abit BE6 with 4 IDE slots. First two support ultra DMA33 IDE , while the last two support (Hpt366) ultra66 IDE devices. Every board has the two IDE for HDD and CDrom and a third ,which is smaller for the floppy. The Abit BE6 has two extra IDE slots... for HDD high speed data transfer ATA66...now they're up to ATA133. but at the time i bought the MB (2001) , it was quick. In 98SE i had no problems with these devices... now that i've upgraded to XP...problems. i have trouble getting XP to install with two HDD connected to hpt366 IDE slots. if i connect the copmputer to first two IDE it loads XP. if I try and connect both HDD together or separately to one of the last two IDE slots , my system freezes during installation. i load the hpt366 v1.3 (XP version) drives for the 2 extra IDE slots. but that does nothing. if i have only one HDD connected to the extra IDE , i'm able to load XP. If the system is up and running, One HDD connected to extra IDE and i try to connect second hDD, the system fails to boot. any suggestions??