Windows 10: Storage bug? summary capacity & usage greater than disk/partition size

  1. Berk's Avatar
    Posts : 14
    Windows 10, Windows 7, Linux Mint 17.3
       11 Jan 2016 #1

    Storage bug? summary capacity & usage greater than disk/partition size

    re Settings -> System -> Storage

    It seems as though Windows 10 can add some, but not necessarily all new or detected partitions to an aggregate capacity under the label This PC (C: ) Even if the partitions are empty NTFS or RAW (inc. Linux Swap?) also include them as usage: 'System & reserved.' I haven't able to discern a pattern of how Windows 10 determines if a new or empty formatted partition will be added to the aggregate Storage summary. At best it's confusing, and appears to be broken.

    Further: deleting some partitions, or shutting down, unplugging disks and rebooting does not necessarily alter the reported aggregate that is shown for This PC (C: ) i.e. You would expect removing all drives and partitions to restore This PC (C: ) status to show only the Windows partition capacity - it doesn't and it continues to show 100s extra GB that are no longer present on the PC.

    e.g. on my previous install I was seeing an impossible 239GB 'system & reserved' with 323GB 'capacity.'

    My system:
    • Windows 10 & 7 partitions each = 100GB
    • Windows disk total capacity = 223GB
    • Other disks, mix of NTFS, EXT4 (Mint 17, /home) Swap (Linux)

    N.B. I've tried this a couple of ways with fresh installs on clean disks and see the same result. It doesn't make a difference if Windows 10 or Windows 7 is installed first. I have made the partition order: recovery|efi|msr|windows|other

    Other things that make no difference:
    • Removing or assigning new disk letters
    • For both Windows 10 and Windows 7:
      1. Hibernation is disabled (from admin cmd terminal)
      2. Page-file management to be on C: only (other disks set to none)

    At the moment I am unsure if this is merely a 'cosmetic' issue or something that might cause more serious functionality problems later e.g. not being able to install since Windows incorrectly thinks a drive or partitions are used or reserved.

    I'm guessing this is multi-boot related, but does this strange Storage summary behaviour occur on anyone's system with Windows 10 only? Is anyone aware of this issue in dual/multi-boot PCs? is there a known bug or fix?
    Last edited by Berk; 11 Jan 2016 at 16:08.
      My ComputerSystem Spec

  2.    11 Jan 2016 #2

    Me too. I'm using 50GB of my 32GB partition apparently.....

    Click image for larger version. 

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    Actually I think you are right - for me it thinks my 32.6GB partition is 57.4GB as it adds on HFS partitions.

    Number  Start (sector)    End (sector)  Size       Code  Name
       1              40         1024039   500.0 MiB   2700
       2         1024040         1433639   200.0 MiB   EF00  EFI
       3         1435648         1468415   16.0 MiB    0C01  Microsoft reserved ...
       4         1468416        69982207   32.7 GiB    0700  Basic data partition
       5        69982208       186220543   55.4 GiB    0700  Data
       6       186482800       235708599   23.5 GiB    AF00  El Capitan
       7       235708600       236978135   619.9 MiB   AB00  Recovery HD
    I'm pretty sure it is only cosmetic so I'm ignoring it

    EDIT - if I boot from another Windows instance then the same 32.6GB partition is seen as correct size

    Click image for larger version. 

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    Last edited by lx07; 11 Jan 2016 at 13:10. Reason: Another view...
      My ComputerSystem Spec


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