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Half of HDD disappeared

  • Hard Drives
  • Storage
Last response: in Storage
February 2, 2013 11:24:37 AM

Hello everyone,

I have the strangest issue that I have encountered until now. Yesterday, the computer was running a little bit laggy and I have restarted it a couple of times with the Restart function of Windows (no hard restarts). Upon the last restart, one of my partitions (D:\) appeared in RAW format, being inaccessible, while another one of about 25GB completely disappeared.

The hard drive is a WD2500JB-00REA0 and it has a size of 250GB. Currently, only the D:\ drive appears and it has 119GB of non-formatted data. The HDD appears in the boot screen and it can be assign as a Boot Device in the BIOS screen.

I have tried:

- the Western Digital utility of scanning HDD's - both the quick and extensive test returned absolutely no erros, but the HDD is recognized as having only 128GB.
- the EaseUS Partition Master Home Edition, in which only the D:\ partition appears, at 119GB, but it also sees 250556187 sectors with no bad sectors on a surface test - as shown in this image.
- the diskpart utility, but there is no trace of the 25GB disk

What could have happened? And there is any other way which I could use in order to retrieve the 25GB partition which I need the most, as it contains a lot of impotant files?

More about : half hdd disappeared

February 2, 2013 7:42:24 PM

I have just tried this with no success. Only the 119GB partition appears there, the other one, that I need, is still not appearing.
a c 459 G Storage
February 2, 2013 11:48:39 PM

It sounds like the drive may have been truncated with a Host Protected Area (HPA). If so, then you should be able to restore the full native capacity of your drive using HDD Capacity Restore Tool or HDAT2. The procedure for creating or removing a HPA is explained on page 5 of the HDAT2 Cook Book.

Explanation of Host Protected Area:

HDD Capacity Restore Tool:

HDAT2/CBL Hard Disk Repair Utility: