Hi, All 4 drives now work after power on, with the following arrangement. IDE bus 0 (primary) IDE bus 1 (secondary) Master Slave Master Slave Main Hard Drive DVDRW Second HD CDRW For the record: The main HD and the CDRW are the original ones fitted by Castle (first batch of Iyonix PCs in 2002), the second HD is a Maxtor Diamond Plus 9 80GB ATA/133 and the DVDRW is a LITEON SOHW-1693S23C. Perhaps this will be of help to others contemplating having these drives. Also, it is easier to fit the cables round each other if at least one of them is a round cable (as opposed to a flat ribbon cable). Cheers, Dave Lane -- Just 5 steps to wars: Bush - Bash - Bass - Bars - Wars --- To alter your preferences or leave the group, visit //www.freelists.org/list/iyonix-support Other info via //www.freelists.org/webpage/iyonix-support