In message <>, 
Hans Petter Selasky <> wrote:

>If you plug another USB device like a memory stick, does the same happen?
>Is your USB HDD self powered?

Thank you very much for your questions.  I am ashamed to admit that I
simply did not stop to think that I should try various USB devices to
see if any others would make a difference to this problem.

Now I have done several tests, based on your questions, and the specific
device being plugged in quite clearly _does_ make a difference.

I am fortuante that I happen to have several USB memory sticks on hand,
including both USB 2.0 and also USB 3.0 sticks, and I also have on hand
three (3) different USB 3.0 external 2.5 inch (5400rpm) drives.

I've tested all these now with my new Anker[tm] USB 3.0 PCIe card, and
now I know what I did not know before... the problem I described is
apparently limited to just one of my external USB 3.0 hard drives...
which is indeed self-powered... although I'm not at all persuaded that
that makes any difference.

All of my USB 2.0 & 3.0 memory sticks work just fine with the Anker card.

Of my USB 3.0 external hard drives, I have just the following three:

      1)  Hitachi Mobile Touro (Model 0S03452) 500GB 5400rpm (self-powered)

      2)  HGST 2.5" 1TB/5400rpm drive (model 0s03508) mounted inside of a
          brand new Patriot[tm] Gauntlet2 external 2.5" USB 3.0 self-powered

      3)  identical to #2 above

The latter two drives work just fine with the Anker PCIe card, with no
problems whatsoever.

>From all my testing, it is now 100% clear that the only problem is with
the Hitachi Mobile Touro drive.  As noted above, this drive is self-powered,
but then so are the other two external 2.5" drives that I have had complete
success with, so I really don't think that this is a power issue.  I should
perhaps note also that I have used the Hitachi Mobile Touro also with my
laptop (USB 2.0 port & Windows 7), with another computer (USB 2.0 only,
Windows 7 & 2000) and even with my LG Blu-ray player, and it has never
before given me even a hint of trouble.

But clearly, there is some incompatability between the Hitachi Mobile Touro
and the Anker PCIe USB 3.0 card.

I will inform the manufacturer.

Thanks again for your questions and makeing me do my homework.  I apologize
for failing to have done it earlier.


P.S.  For whatever it's worth I also don't believe that this problem has
anything to do with power supply issues because (a) the little blue light
on top of the Hitachi Mobile Touro does in fact come on when it is plugged
in, and also, the Anker[tm] card _does_ have a place on it to attach a 4-pin
molex power connector, from the system power supply, and I have of course
done that.

It seems that this card and this drive just do not like each other.
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