Thanks Dave,
My aplogies, I'm an OS X noob, linux pays my bills. Looking in Disk Utility, I see Partition Type as 'Apple_partition_scheme' under 'Info', is that the right place to check? FWIW, the box has 'Formatted for MAC' on it on a sticker, nothing like a false sense of security.
Looking at the *SECOND* post on my google search, it's pointed out quite plainly that this is not an Oxford chipset as well. Dang, I chose poorly... I'll happily buy a new enclosure, and while I realize your job is not to recommend hardware, can give me a hint to search on?
Best Regards,
Lee