Just discovered this by accident. I'm running a MDD 1.25 with some extra harddrives mounted internally.and having some operating problems now and then I did a system profile run recently and discovered the following: disk 1= t(the OS disk) Connection bus : ATA connection type : internal connection ID : device 0 disk2= ( my audio drive) connection bus : ATA connection type : internal connection ID: device 0 !!!!!!!!!!! disk 3= (audio drive) connection bus : ATA connectio type: internal connection ID: device 1 So disk 2 has the same connection ID as the OS drive : IS this OK, or should I change some jumpers on the disk ? I know that the computer has 2 different ATA busses . I guess the OS disk is connected at the hi speed buss, don't know where to look at in the system profiler to see where the different disk are hooked up