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External Hard Disk not recognised...

Posted on 2009-04-11
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Last Modified: 2016-06-26
A friend has a Western Digital external USB drive, WD2500XMS-00 , which is no longer recognised by Windows XP.

i tried it on two XP systems and it appears to spin up OK, although by listening carefully it makes an occasional 'clunking' sound as it starts up - it doesn't overheat, but it isn't recognised at all.

I tried it on my Vista SP2, sorry, Windows 7, system and it DOES appear (sometimes) in disk management but says it isn't initialised - and won't initialise either.

I booted UBCD and tried the Western Digital utility but that didn't see it either.

any ideas?
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Question by:chrisfixit
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by:WizardWill
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sounds like faulty hardware the fact it does not work on multiple pc's.. i hade this issue once i change the encloser (put the hard drive in a new one) and it worked again fine..
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by:skywalker39
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Hi chrisfixit,

It could be a problem with your external hard drive or enclosure. I would take the hard drive out and do some tests to make sure that the hard drive isn't bad or going bad. I would also take that drive and put it in a new enclosure, it's possible that the hard drive is fine and the enclosure is no good.
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by:coredatarecovery
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This is not an enclosure problem.

The clunk you hear is called a "Failure to seek Home"

It is caused by the inability of the drive to find track 0 or -1 where the drive table is that identifies where the data is located.

This will most likely be 1 of 3 things.

1. Can be caused by the drive RPM being variable. (too much friction or electronic in nature)

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coredatarecovery earned 500 total points
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2. Can be caused by an electronic failure to amplify the data coming from the heads, (Or firmware problem) so the circuit board underneath is bad.

3. Physically could be damaged or thrown head. usually associated with a scraping noise when running. (although not always)
 Could also be a preamp problem inside the drive.

Hope this helps, You can scour ebay for parts if you wish to attempt the repair yourself or you can choose a data recovery company like ours to recover your data for you professionally.

Chuck House
Core Data Recovery
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