I have a Drobo 4-bay (2nd generation) which was originally filled with 1 TB drives. Over time, I've replaced the 1 TB drives with 2 TB drives, and now I want to re-use one of the 1 TB drives for other purposes. I know I'll have to re-format it, that's no problem. I have an enclosure for it, and I installed it correctly in the enclosure, but when I plugged it in, it won't mount.
Is this a typical problem with a drive that's been in a Drobo? Is there something I should do to get it to mount so that I can reformat it?
Update: Sorry, I should have specified the system particulars. I'm running OS X 10.6 Snow Leopard, up-to-date. The Drobo is running firmware version 1.3.7. The drive doesn't show up in the Finder nor in Disk Utility.