I have obtained the hard disk from my old work PC which was Win NT and I have tried to add it to my Win XP system at home, the IDE cable is clearly marked with Master/Slave plugs and I have tried the 2 disks as Master/Slave and also both a C/S but the only disk seen is the NT one.
I always use Cable Select (CS) for both drives if using an 80way ribbon cable with the black plug being Master and grey being Slave, otherwise with a 40way cable I use Master and Slave. Also some drives have a different setting for Master with Slave Present. Have you checked in the BIOS to make sure that Primary Slave is set to AUTO and not to Not Installed?
I have tried the 2 disks with the jumpers set to Master/Slave (both combinations)and also both with jumpers as C/S but the only disk seen is the NT one.
I have even swapped the NT disk onto the other IDE channel but didn't work either.
I haven't made any bios changes, I'll try that later, thanks
After I tried the NT disk on the other IDE channel I must have not put the optical drives back together correctly and the whole system wouldn't boot at all, I was going to go intio the bios but couldn't and getting the system to boot was more of a priority, then I ran out of time.