Old drives like an 8GB frequently had to use 3rd party partitioning software to get the old machines they worked with to recognize them. IF they are not the boot drive then the software that enables the drive doesn't work, and they aren't seen. IF you run FDISK do you see the drive when you select option 4?

When you plug in a drive with a single partition it will become the D: drive, if it actually works, pushing the first drive's D and E partitions to E and F.