3 TB HDD now GPT, but still can't create simple volume over 1907600 MB

It's a DT01ACA300 hard drive.

Using Windows 8.1 and an Asrock H77M UEFI motherboard.

Any ideas?
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  1. I never had an issue.

    So it shows about 2/3rd partitioned and 1/3rd unallocated now in Disk Managment?
  2. I suspect that your BIOS may have a bug that truncates the drive.

    If so, then see Q2 for an explanation and solution:
    http://www.users.on.net/~fzabkar/HDD/HDD_Capacity_FAQ.html
  3. photonboy said:
    I never had an issue.

    So it shows about 2/3rd partitioned and 1/3rd unallocated now in Disk Managment?


    I haven't formatted it yet as I want more than 2 TB, which is all it will allow.



    I've installed the ASRock 3TB+ Unlocker Utility but nothing appears to have changed?

    EDIT: Restarting the computer fixed it.
  4. It's not a 2TiB issue, so Unlocker won't help.

    Instead use HDAT2, HDD Capacity Restore Tool, or http://www.itsecure.at/hparemove-v0-1.

    1907600 MB = 2 000 263 577 600 bytes = 2TB (not 2TiB)
  5. fzabkar said:
    It's not a 2TiB issue, so Unlocker won't help.

    Instead use HDAT2, HDD Capacity Restore Tool, or http://www.itsecure.at/hparemove-v0-1.

    1907600 MB = 2 000 263 577 600 bytes = 2TB (not 2TiB)


    Nope, the Unlocker worked perfectly :)

    Disk Management is now reporting 2861459 MB.

    Now I need to decide whether to go for NTFS or exFAT.
  6. ISTM that Unlocker's apparent success may have been a coincidence. The marketing blurb states that "the fantastic 3TB+ Unlocker tool offers a tweak-friendly feature, breaking the limitation of 32-bit operation system that could only detect the hard disk within 2048GB. "

    This suggests that Unlocker is designed to circumvent the 32-bit LBA limitation of your OS. Notice that 2048GB = 2TiB, not 2TB. The latter is a BIOS bug.

    Sometimes the 2TB bug can be automatically repaired simply by changing the boot order in BIOS.
  7. When I installed my 3TB drive I did it something like THIS:

    1. Computer Management-> Disk Management
    2. right-click the unallocated space on the 3TB drive and "Create new Volume"
    3. The drive should then show 2794GB approximately and HEALTHY.

    I forget if it asked if it was to be MBR or GPT or if it even asked but I had no issues (GPT if asked I believe). You can't FORMAT a drive unless the Volume is created first, though it is formatted as part of creating the Volume.

    *So where in the above process does the problem occur?

    I always do a FULL FORMAT on any new hard drive after the Volume has been created to build up the bad sector table. It will take perhaps 12 hours or so I think.

    (If the drive already has a volume and doesn't show unallocated space, then right-click and DELETE any volume present and repeat my steps.)
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