I've been having this problem for quite some time, and have taken to leaving the drive unit off except when I really need to use the info on it. Which is a pain, I use one partition as the backup of my iMac's internal drive ... so I have to remember to turn it on before each regularly scheduled backup.
Here's the info from Apple's profiler:
Manufacturer: BUFFALO INC.
Model: 0x0
GUID: 0x402603E00909A8
Maximum Speed: Up to 800 Mb/sec
Connection Speed: Up to 800 Mb/sec
Sub-units:
HDD Unit:
Unit Software Version: 0x10483
Unit Spec ID: 0x609E
Firmware Revision: 0x110
Product Revision Level: 1AA0
Does that help identify the product?
What are the plans for fixing this issue? Or is our only solution to return the units under warranty?