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Toshiba USB 3 external HDD not being detected after a while

Posted on 2011-09-04
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Last Modified: 2012-05-12

When I connect up my Toshiba USB 3 external hard disk to
my Thinkpad, it detected it initially.  I started copying lots of
files (using xcopy) from another USB HDD to it & just a few
minutes into it, the Toshiba USB drive got "disconnected".
I'm sure the USB cable connection is firm.

I would disconnect this Toshiba USB HDD & connect it back
& repeat the same copying again & it consistently (3 times in
a row) give this phenomenon.

I then disconnected this USB HDD & connect up a WD USB 3
HDD to the very same Thinkpad USB port & repeat the same
copying but don't have any issue with this WD USB 3 HDD.

So look like it's not the Thinkpad's USB port nor the Thinkpad
but the Toshiba USB HDD.

I haven't got to try out this Toshiba USB HDD on another PC/
laptop.

Attachment 1 is the error that surfaced in Event Viewer of this
Thinkpad when the Toshiba USB HDD started to lose connection
& attachment 2 is the error that happened at about the same time.


Any idea & what other troubleshootg steps I can take?
ToshibaUsbHdderr1.jpg
ToshibaUsbHdderr2.jpg
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Question by:sunhux
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Author Comment

by:sunhux
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One more error which happened at about the same time
ToshibaUsbHdderr3.jpg
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Aaron Tomosky earned 500 total points
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Sounds like it's going to sleep. Open device manager and uncheck allow windows to turn off this device to save power
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Author Comment

by:sunhux
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How can it be in 'sleep mode' if I did an "xcopy/e/c/h  WD_HDD:\dir1  Toshiba_HDD:\dir1"
& it was still copying that hundreds of thousands of files when the Toshiba 'dropped'
connection?  Thought would only go to sleep if it idles, or it would go to sleep despite
there's active IO going on?
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Assisted Solution

by:Aaron Tomosky
Aaron Tomosky earned 500 total points
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I've had file transfers goin on and after not touching the keyboard for a few my network card was going to sleep. Just a thought. Easy enough to simply check and see if it works.
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Author Comment

by:sunhux
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I just swapped position between the WD & Toshiba WDD & this time round, the copying
run for 2 over hours till I shifted the Toshiba WDD a little & the Toshiba connection
dropped immediately.  Could it be a bad cable or USB3 pin of the Toshiba?

The WD is quite robust & maintains its connection despite being moved around

The Toshiba is a newly purchased HDD & comes with 3 years warranty.

Does those Event Viewer screens I attached give any clue at all?

I tried moving the Toshiba a few more times : it does not always lose the connection
to the laptop so not consistently reproducible
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Author Comment

by:sunhux
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I read one link that says certain USB port on the very same PC/laptop
may provide different power/voltage & another port may have more
power to sustain an external USB HDD.  How can I check if it is (or it
is not) due to insufficient power/voltage ?

How can I check/verify if it's due to the USB 3 cable fault?
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Author Closing Comment

by:sunhux
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not quite
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Author Comment

by:sunhux
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Unsafe removal of (USB) disk is listed as one of the cause with the
power supply & bad connection being listed :

http://social.microsoft.com/forums/en-US/whssoftware/thread/183c650d-0344-4dc2-a7f5-6da88142520a
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