Windows 10: Incorrect disk usage values displayed in Settings > System > Storage Solved

  1.    01 Aug 2016 #1

    Incorrect disk usage values displayed in Settings > System > Storage

    If I open Settings in Windows 10, then go to System > Storage, I get the following usage for C:
    161Gb used of 285Gb
    whereas File Explorer gives the more sensible 21Gb used of 145Gb, which is almost certainly the correct values, given that it is a 145Gb partition, and is a fresh install of Windows 10. The C: partition is on a 480Gb SSD drive.

    Here is a screenshot of disk management showing the correct values

    Click image for larger version. 

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    And here is a screenshot of the Storage screen with the incorrect values

    Click image for larger version. 

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    Can anyone explain why this is?

      My ComputerSystem Spec

  2.    01 Aug 2016 #2

    The C: drive partition is correctly identified as 145.70GB, however if you add up the rest of the partitions without drive letters (ie) 139.70GB + the hidden 350MB and 450MB partitions, you get 285GB not including the 160GB of Unallocated Space. Since the other partitions don't have drive letters, System/Storage is lumping those drives into the total capacity of C:.
      My ComputerSystem Spec

  3.    02 Aug 2016 #3

    I see. The figures do add up as you have specified, but I think it is confusing that it reports the capacity of the other partition as though it was part of C: The 139.70Gb partition is an EXT4 partition (my Ubuntu install). However, it is mounted in Windows using an EXT driver as drive E: but I guess that Windows is confused by this and assumes the drive is full and reports it as 100% used. Adding this with the used capacity of C: of around 22Gb would give the utilised figure of 161Gb. Thanks for your help.
      My ComputerSystem Spec

  4.    02 Aug 2016 #4

    Are you sure you are not confusing this 139.79GB partition with your secondary HDD that also does not have drive letters in Windows, so I am assuming this Disk 1 is Ubuntu? If the 139.79GB partition is E: in Windows, the drive letter is not showing in Disk Management, Try right clicking and assigning this partition with a drive letter.
      My ComputerSystem Spec

  5.    03 Aug 2016 #5

    Yes, I am sure. I have the root partition on this drive, which is an ssd drive. The other hdd drive contains data partitions. I don't know why it's not showing up in disk management, but it is showing up in file explorer correctly, with the 1.4 Tb data partition on the hdd mounted as D:. The 8Gb partition on the hdd is just a Linux swap partition. I'll post an image of File Explorer later tonight to demonstrate this.
      My ComputerSystem Spec

  6.    04 Aug 2016 #6

    Image of File Explorer as promised. I cannot assign drive letters to these partitions in Disk Management. I guess the conclusion to be drawn is that Disk Management does not recognise non-Windows partitions, Storage gets confused by it, and File Explorer has no problem at all. In any case, at least I know now not to trust what is displayed at face value. Not sure if this is a bug or a "feature" and whether I should report it.

    Click image for larger version. 

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      My ComputerSystem Spec


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