Hard drive doesn't show up in preferences?

Hi,
I have an external hard drive that I want to use as the scratch disk in photoshop but it doesn't show up when I open preferences>performance? My other two hard drives that are connected and mac HD show up though ? 

Also, make sure you have read and write permissions on that drive.
On second thought, a FAT32-formatted drive might also work, but I can't vouch for that, as I never run FAT32 drives.  Sorry.

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