Windows 10: External drive reporting wrong capacity Solved

  1.    16 May 2017 #1

    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...
    Last edited by Leyobahn; 16 May 2017 at 04:37.
      My ComputerSystem Spec

  2.    16 May 2017 #2

    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
      My ComputerSystem Spec

  3. Berton's Avatar
    Posts : 5,265
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       16 May 2017 #3

    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.
      My ComputerSystem Spec

  4. Bree's Avatar
    Posts : 8,551
    10 Home x64 (1803) (10 Pro on 2nd pc)
       16 May 2017 #4

    Leyobahn said: View Post
    We use a 1tb Western Digital USB3 external drive for a system backup on a desktop PC under windows 10...

    The Windows Image Backup file is approx 560gb. Problem is the drive is now saying there is only 79gb space available on the drive...

    Any idea what's happened to the remaining disk space or how we can get it back?
    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
      My ComputersSystem Spec

  5.    16 May 2017 #5

    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
      My ComputerSystem Spec

  6.    18 May 2017 #6

    Berton said: View Post
    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.
    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.
      My ComputerSystem Spec


 

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