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I went through a whole process up to this point. I tried restoring from an image backup, but windows wouldn't boot from it. I booted into ubuntu from a usb stick and mucked about with the partitioning, eventually expanding c: to fill the rest of the free space. Predictably after that windows still wouldn't boot so I decided to just reinstall windows fresh since I could manually copy files from the backup image anyways. I spent a while setting my fresh windows install up till I noticed my c drive was much smaller then expected.

In disk management the total capacity of c: is reported as 111.19GB, but the partition size of c: is 930.88GB. Screenshot showing this in disk management:

enter image description here

Any idea what's going on here?

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    Though Windows does not report it, the filesystem has a fixed size. After extending the partition itself, the filesystem also needs to be extended, as you found out. // I recommend altering Windows partitions only using Disk Management or diskpart as much as possible. It is the safest way to deal with NTFS partitions.
    – Daniel B
    Commented Nov 7, 2022 at 19:29
  • @DanielB Thank you for the information! That's a good explanation and advice. That knowledge will definitely come in handy in the future. I didn't know that NTFS was different in any way and modifying it outside of diskpart could cause issues
    – Themis
    Commented Nov 8, 2022 at 2:41
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    NTFS isn’t different. It’s just that NTFS is a proprietary filesystem that is developed by Microsoft, so using Microsoft tools is the safe choice.
    – Daniel B
    Commented Nov 8, 2022 at 19:57

2 Answers 2

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Found a solution in the following thread: https://answers.microsoft.com/en-us/windows/forum/all/hard-disk-capacity-shows-wrong-size/31c7229e-aadc-4716-a867-ee5beaf0549e

Copy and pasted solution:

  1. Close any open applications

  2. Click your Start Button, then just type cmd

  3. On the resulting list, right click Command Prompt and choose 'Run as Administrator'

  4. Run this command and press Enter:

    diskpart

  5. Run this command and press Enter:

    list volume

  6. Run this command and press Enter (replace # with the volume number of that C drive partition)

    select volume #

  7. Run this command and press Enter:

    extend filesystem

When that command completes, close Command Prompt and re-start (not shut down) your PC, then check the reported size of that partition.

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-1

That's because you're looking at the wrong drive. Your C: partition is on Disk 3, which has a total of 931GB, and you're looking at Disk 2, which has 111.19GB.

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2
  • No; You are looking at the wrong drive. DISK 3 has three partition(s). There is most definitely something wrong about that disk's partition table.
    – Ramhound
    Commented Nov 7, 2022 at 16:01
  • The partition is displayed as 930.88 GB on the diagram, but the filesystem is listed as 111.19 GB at the top.
    – gronostaj
    Commented Nov 7, 2022 at 19:04

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