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usb hard drive showing as unallocated windows xp pro

Posted on 2010-11-21
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Last Modified: 2012-05-10
I have a 1 tb external hard drive. I have been using it and it was working fine. All of a sudden, I tried to access it and the drive letter was not showing up and when I go to device manager, it is showing as unallocated. Luckily, there is nothing on there that is up great importance, but I would like to get it back if possible. Any suggestions?
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Question by:premiere1
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by:shanyuen
ID: 34185093
Don't re-format or re-partition it.
It's caused by abnormal USB power.
Try to plug it to another pc, or use usb adapter if provided.

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Expert Comment

by:johnb6767
ID: 34185405
Does it work on another PC?

In my experiences, 99% of USB drive failures are the enclosures themselves.....If it is not under warranty, I would take it out of the enclosure, and see if the drive is still good. Then, instead of having to buy another USB Drive, just need a case for it.....
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noxcho earned 500 total points
ID: 34186053
Run Undelete partition operation on it.
Download trial version of Paragon Backup & Recovery 10 Home: www.drive-backup.com and install it.
Run it - right click on unformatted space and select - Recover Lost partitions. See if it finds anything. When found - restore it.
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by:caballo_oscuro
ID: 34186965
this happend to me with two different reasons.
1. the cable i was using fromt the drive to the pc would work with some laptops etc but not my toshiba, because it worked on others i was downloading drivers updating xp and all sorts of rubish. i eventually changed the lead and it worked first time every time since. this was a western digital drive.

2. the second fault happend with a usb stick type drive which would not be recognised to read from.
i went into device manager and deleted entry and rescanned for hardware changes then when it seen it and tried to reinstall driver i told it to go to a specifc location, then said i had disc then it listed potentail options one being mass storage device, i chose this and it started working correctly, this was a sony device. good luck
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by:premiere1
ID: 34187728
I have not tried any of the suggestions yet, but thanks for all the suggestions. Here is a fullowup: It does not work on other pc's either. It is a cirago. Tried new cable. Did not help. Another note, by cd/dvd drive quite working about the same time also. Have tried deleting and reinstalling nd keep getting an error. xp has all updates.
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Expert Comment

by:caballo_oscuro
ID: 34189010
you may have a corrupt drive. If you can live without the data and if you can not get at the data then you may have to face up to trying to format the device.
 If the device can not even be seen to format it then i would also suggest that you plug it into either a mac or a linux installation and see if it can be seen there?
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by:premiere1
ID: 34189858
I did not try paragon yet, but I had a copy of bootitng, and tried the undelete option, it hang for an hour with no progress, and when I rebooted with bootitng, it showed it there, I rebooted into windows, and it was still unallocated. Is anyone familiar with that software? I powered down because it seemd to be hung without any progress after an hour. I am going to try paragon and see if that does any good.
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by:noxcho
ID: 34190000
Try Paragon. It is free.
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by:premiere1
ID: 34191632
I downloaded paragon and installed it. It sees it and says backup (name) 931.5 unknown. It does not give me the option to undelete. What do you suggest? One of the options is give it a drive letter.
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Expert Comment

by:noxcho
ID: 34191816
There is Volume Explorer option on the main interface of this tool. Try to browse the volume with it and see if you can get your data.
Also check for STUBACT.log file in C:\Program Files\Paragon Software\Backup & Recovery\Program folder. Load it here.
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Author Comment

by:premiere1
ID: 34197745
I did delete partition and then undelete partition again. I think I did not wait long enough with bootitng or that would have done it also. It ran most of the night. Thanks for all your help. That software is nice. I may have to pony up and buy it.
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by:noxcho
ID: 34198613
Thanks for feedback.
Nox
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