Ok, I was using Partion Magic 8.0 to repartition my second HDD. It is a Maxtor 60 GB HD. I was going to use the secondary partition to install Linux, so I used all the default options for the new partition, including setting it as active. The process went off without a hitch or any error messages. However, when I rebooted my computer, it could no longer recognize the second HDD at all! I went into the Management console to check it out, and it still saw all the different partitions on the drive, but it called the Windows section an "unknown partition", and it no longer referred to it's drive letter D:.
Unfortunately, the Partion Magic software was on the D: drive, so I can't even use it to undo the changes.
Any suggestions on getting Windows to recognize the D: section again so I can get all my files back? I really don't want to delete anything.