CS2 not recognizing external hard drive as a scratch disk

I have an external hard drive that I want to use as a scratch disk but while I can navigate to have Photoshop open files from the drive, when I go to my prefs and try and select it as a scratch disk, it's not listed as an option - i.e. Photoshop only shows "start up" and "Mac Hard Drive" as choices. But when I go in that same dialogue box, and look for an additional plug-ins folder, I can navigate to the external drive. It's also doing the same thing for a thumb drive I have and two other external hard drives which mount fine.
I have restarted the program, removed the Prefs file, and restarted the program again but it still doesn't see any of the external hard drives.
Any ideas?

mike,
Most drives are not optimized for Mac as purchased. Unless marked otherwise, consider that every drive you acquire, whether a fast-spinning hard drive or USB flash drive comes formatted as FAT so it can be recognized and used by both Macs and Windows machines. Use Disk Utility and reformat it as HFS+ "Mac OS Extended (Journaled)".
Just be aware that if you are reformatting your existing drives, you need to back up your data first or it'll be gone forever.
Neil

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