If I switch the drive on before I boot, the BIOS recognizes it correctly. PCLOS however doesn't see it. It's not there in the PCC or via 'df' in a terminal.
The system is Athlon 64 dual core 7550 processor; 2 gb RAM; 2 internal SATA drives; 512mb nVidia graphics.
If you go into PCC > Local disk > Manage disk partitions, you should see one tab for each internal SATA drive. You should see a third tab for your external SATA, as long as BIOS is recognizing it.
When it had a USB connection, udev was controlling it. Now that it's on a SATA cable, you'll need to create a mount point using the Manage disk partitions tool. Make sure you're looking at the new drive, then create a partition table and partitions, or use what already exists. If you use what already exists, you will still need to create a mount point. When you quit the program, it will ask if you want to save changes to fstab. Answer yes.
NOTE: If you don't specify any mount options, fstab changes won't take effect until you reboot. However, you can open a terminal, su to root, and issue the command mount -a
. That will mount all entries in fstab. It won't affect any already mounted. Your mount point should be in /mnt/ directory, and you can create a new name. In the example below, I named one /mnt/Vault.