Windows 10: External drive reporting wrong capacity

Discus and support External drive reporting wrong capacity in Windows 10 Backup and Restore to solve the problem; Hi All, We use a 1tb Western Digital USB3 external drive for a system backup on a desktop PC under windows 10. After formatting it's showing 931gb... Discussion in 'Windows 10 Backup and Restore' started by Leyobahn, May 15, 2017.

  1. Leyobahn Win User

    External drive reporting wrong capacity


    Hi All,

    We use a 1tb Western Digital USB3 external drive for a system backup on a desktop PC under windows 10. After formatting it's showing 931gb capacity.

    The Windows Image Backup file is approx 560gb. Problem is the drive is now saying there is only 79gb space available on the drive. I ticked the "show hidden files" option but there still only seems to be a total of 560gb on the drive.

    Any idea what's happened to the remaining disk space or how we can get it back? Just spent the last hour on Google trying to find a solution but don't seem to be getting anywhere

    Thanks in advance if anyone can help...

    :)
     
    Leyobahn, May 15, 2017
    #1
  2. AngSin Win User

    Drive capacity wrong

    Before that, I spli my 1tb drive to two (901gb and 29 gb) then I delete the 29gb volume and extend to the 901gb volume with disk management then i get a error (the perimeter is not correct) so i ignore it and restart pc . After that the 29gb just missing
    from my computer but it does showup in diskmanagment and diskpart . As the image showed, my pc show only 901gb but disk management showed that i have 931gb?? Sorry for broken English.....
    External drive reporting wrong capacity [​IMG]
     
    AngSin, May 15, 2017
    #2
  3. Drive capacity wrong

    Hi Ang,

    We need to do further investigation so that we can identify the cause of the issue. We suggest running Disk Cleanup first and see if it will make a difference.

    Looking forward to your response.
     
    Radney Dri, May 15, 2017
    #3
  4. cereberus Win User

    External drive reporting wrong capacity

    No. It is just way windows reports a kilobyte as 1024 bytes but strictly a kilobyte is 1000 bytes.

    Thus 931 GB is 931*1024*1024*1023 bytes equals 1000,000,000,000 bytes.

    Drive manufacturers use strict 1000 bytes to kilobyte definition.

    It is actually Windows that is wrong really but been that for ever. If you used same drive on OSX, same capacity would be reported as 1000 GB
     
    cereberus, May 15, 2017
    #4
  5. Berton Win User
    My MacBook Pro with a 500GB HDD is showing as 498.88GB using Mac OS Extended (Journaled) formatting. It also could be called HFS Plus. The formatting of HDDs using FAT/FAT16/FAT32, exFAT or NTFS will report different capacities.

    Windows and the older DOS basically use multiples of 2 when working with RAM/Random Access Memory and drive storage such as 2, 4, 8, 16, 32, 128, 256, 1024, etc.
     
    Berton, May 15, 2017
    #5
  6. Bree New Member
    Welcome to TenForums @Leyobahn

    You may not want to get it back, not if it is occupied by a volume shadow copy that may have been created when you made the system image. To see how much space is used by VSS, open a Command prompt (Admin) go the external drive and type: vssadmin list shadowstorage
     
  7. Leyobahn Win User
    Thank you Bree!

    We got our IT consultants on it and that is exactly what happened! Have now learned about "shadow copies"

    Thanks for your help all x
     
    Leyobahn, May 15, 2017
    #7
  8. cereberus Win User

    External drive reporting wrong capacity

    Apple use strict definition of kilo as 1000.

    Windows do not. The term KiB has now been introduced to mean 1024 (GiB is 1024*1024*1024 whereas as GB is 1000*1000*1000).

    So Windows actually reports GiB but calls them GB (of course windows predates GiB).

    so 931 GiB = 1000 GB.
     
    cereberus, Apr 5, 2018
    #8
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External drive reporting wrong capacity

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