HT3986 I'm having trouble partitioning my hard drive, I'm attempting to do this from the recovery drive because it's more convenient.  But when it gets about halfway through the process, there's an error message saying that it's having trouble unmounting

Just realized that the title was limited anyways, I'm in the recovery drive on my macbook pro, trying to partition my macbook with another user (not windows, just another user) with only like 10GB.  It goes fine until it's about halfway done with the process, where it freaks out and tells me that it can't unmount the harddrive. Any suggestions?

Hi, BDAqua,
Nice to hear from you. You helped me with another recent question. Thank you.
The external case is Other World Computing's Mercury Elite Pro with Oxford chip set. Drive is an Hitachi deskstar 500 Gigabyte disk (I'll dig around for exact specs, if needed).
Weird thing is that the drive (partitioned into two disks, one boot, one for files) shows up in the Finder and in Disk Utility, but not in System Profiler. It's not visible at all there (not under Firewire, by which method it is connected, nor anywhere else). I can access its files, though, via Finder.
Very strange.

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