umass0: BBB reset failed, IOERROR

[Peter]

Hi, I've run into a very frustrating problem and I hope someone can
advise.

I acquired two 200 GB USB drives of the same model* and I had tested
them both on a 5.4-STABLE and a 6.0-STABLE system.  Both had a dislabel
on /dev/da0s1d and were working fine.  I transported my 6.0 gear to
another location (by car); set up both drives; and tested them.  All
good.  Later in the evening I could no longer access one of the drives;
it could not be mounted:

umass0: BBB reset failed, IOERROR
umass0: BBB bulk-in clear stall failed, IOERROR
umass0: BBB bulk-out clear stall failed, IOERROR

I cam back home to my 5.4 system and I experience the same problem.

What happened and how should I proceed?

* www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=1428323&CatId=0

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