3TB Problems - Visible in BIOS but nowhere else

Daviddsh

Reputable
Jul 19, 2014
2
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4,510
Hi. In all my years in IT I have never seen a problem like this - and that's saying something!

One of my customers has passed a Seagate 3TB external HDD which he used to use a lot, but left it on a shelf for a year, and now could not gain access.

The disk powers up and runs smoothly with no tell-tale clicks or anything else to suggest the drive is physically damaged.

I brought the thing home and plug it into my W7 desktop, it came straight on, showed me all the folders/files, no problem. But when I started to try opening a few files, not one would.

I should mention that my customer, after speaking with Seagate themselves, ran a CHKDSK on it, which was not a good move, as the brief look I had of the disk properties show 2TB free space and 1TB. I didn't get a chance to check it in Disk Manager because next time I tried to look at it, the folder info was gone, and the disk name had reverted to "Local Disk"

All subsequent attempts to access the drive via USB have failed. So, I tried a SATA connection in my desktop. The BIOS recognised the drive as a 3TB and it's model identifier. But that's all. Not visible anywhere in Windows.

I am at a loss to know what to do next. How is it possible to have full access to the file/folder structure, and now it's inaccessible completely, apart from the BIOS reference.

Could the CHKDSK have screwed it up completely? As I said, I have no reason to suspect the disk is faulty. Besides, an non-functioning drive wouldn't show in BIOs - or would it?

Any advice would be very welcome as this is driving me nuts! Thanks
 

Daviddsh

Reputable
Jul 19, 2014
2
0
4,510
I have had some developments since I wrote the above.

I tried once again to connect via USB and I got the disk to show under Devices. It was shown as a USB Mass Storage Device at first, then after about 20 minutes, it added "Disk Drive" to the hardware list under Properties.

I tried Disk Management next and again, 30 minutes or so, it was listed! It was shown as "Raw" and it wouldn't let me "Mark Partition As Active", just kept coming up with "The specified file could not be found". It showed the capacity as around 2700GB But it was listed under Windows Explorer as "Local Drive F". The Properties showed no files or folders.

Now, I am trying a data recovery program on it.

It is baffling to say the least. It took so long to do everything. Are these the symptoms of a drive that is failing physically?

If anyone could help solve this mystery for me, I would be very grateful. I have spent more time on this disk than I can really afford but I don't like to be beaten!