OK so I need an accurate definition of the term Primary Disk, and Primary Partition (if there is a difference between the two). If by asking me to make sure that the XP disk is set in the BIOS as the primary you mean that you want me to make sure that the XP disk is set as the disk from which my computer is set to boot up from, then that has already been done. You have said that "The Drive set in the bios is primary". That sounds like you're thinking that the S: drive is set in the BIOS as the first disk in the boot order-what I'm assuming you mean when you say "the primary". But this is not correct: S: is not set as the first disk in the boot order. The disk that is listed as Disk 2-the same disk that has XP and Win7 on it-this is the first disk in the boot order in the BIOS. Specifically, it is SATA 1. Disk S:, in its entirety, is SATA 0, and it is actually 3rd in the line of boot order. There is a SCSI drive as #2 in the boot order.
I know all of this because I physically removed a drive just so I could correctly identify whatever was left. As it turned out I removed SATA 0, and the computer booted up normally, on the only remaining disk: SATA 1, and it booted up on one of its two OSs: XP.
I have noted that in Disk Management it lists every single drive on my computer as a Primary partition-with the single exception of C:, which has Win7 on it, and it is listed as a Logical. So the terminology is starting to confuse me, and I need some clarification.
And how would one change the Primary disk in BIOS?