I already built the disk of one of my external USB drive directly into
my PC (connected via SATA now) and gave the enclosure to a friend. The
other USB disk I have is still external, but I had never problems with
it.
So could it be possible that the problem depends on the actual
USB-to{PATA,SATA,flash} chipset used in the external storage device?
If so, I could test several external hard drives from different vendors at work
with my laptop (i855GM chipset), and we could invite others to to the same, and
build a "compatibility matrix" out of e.g. USB-ID,PC-chipset, USB controller,
USB drive chipset, attached drive model and kernel version. Of course there
must be a way to determine the USB drive chipset without opening the enclosure
(and thus voiding warranty). If there is enough test data, also hardware
defects (defective USB chipset, broken cables, etc.) could be ruled out.
--
USB mass storage stops working after a while
https://bugs.launchpad.net/bugs/61235
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