Question: Unable to unmount disk to reformat My Book for Aperture export

Hello,
I upgraded to Aperture 3.01. I had never exported an Aperture library to an external hard drive before. Aperture 3 would not recognize the My Book Essentials (1 TB) for export. I cannot unmount the disk when trying to reformat from MS-DOS (FAT) to Mac OS Extended (Journaled). I went on the Western Digital website to download driver updates and that hasn't helped either.
Thanks,
Steve K

Same exact issue.  Macbook Pro w/500SSD.  Booting from the recovery partition, unable to modify partitions. No firmware password (if that mattered) etc. Had 2 partitions, now reformatting for single partition and error reads:
Partition failed
Partition failed with the error:
Couldn't unmount disk.
-pr

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