Assuming these are EIDE drives, is the primary C drive at the end of the ribbon cable and jumpered to "master"? Is the secondary drive the middle of the cable and jumpered to slave? Have you tried other jumper settings such as both at cable select?
When I perform such installations, I connect only one drive at a time.. Have you tried removing the second drvie, then formatting and installing Windows XP on the primary drive...THEN installing the second disc on the middle connector of the ribbon cable and let XP recognize the new "slave" disc?
Have you tried formatting the secondary disc BEFORE adding it as the slave?
Hope this helps.
I have Win XP Prof with SP2, and the PC was recently built by myself.
During the DOS boot process, the system does detect the two drives.
However, when Windows comes up, I cant see the second drive in WinExplorer or in the Disk Management of "Computer Management"
The jumper settings are accurate, and I double checked them.