Mountain Lion Time Machine Encryption Fails with External Thunderbolt Drive

I have a Buffalo 1TB MiniStation external Thunderbolt/USB3.0 Drive that I am trying to select from Time Machine with Encryption on. It fails. Further, when attempting to encrypt the drive from Disk Utility, it succeeds however when mounting the disk displays "Unusable Disk" after the password prompt and can only be mounted by re-formatting with encryprion turned off.
Selecting repair disk also does not work as the drive fails to mount.
This can be duplicated using the either connection (Thunderbolt or USB).
I called the manufacturer of the drive and they state it is "Apple's problem".
Any help here?

seejoefish wrote:
I called the manufacturer of the drive and they state it is "Apple's problem".
Unlikely. If encryption works for other USB3/Thunderbolt drives, then it is definitely Buffalo's problem. At this time, there aren't many such drives so it is hard to say. Buffalo's Time Machine customers don't seem to be happy with Buffalo's support: http://forums.buffalotech.com/t5/Storage/bd-p/0101

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