Earlier I shrunk drive C using Disk Management but ran into "The parameter is incorrect" error. I now have the following situation:

According to the top pane in the following screenshot, Disk 0 (which hosts C: and System Reserved) should have 272.25GB - 156.25GB - 100MB = 115.9GB available:

diskmgmt.msc screenshot

But notice that volume C is reported as having 156.25GB in the top pane but 275.15GB in bottom. And I am unable to find the missing space. Where is the missing space and how do I get it back?

  • Backup Disk0 to disk D. Clean Disk 0. Create partition and restore backup.
    – STTR
    Mar 14, 2015 at 5:29

1 Answer 1


Found matching symptoms and the solution here:

Windows Server 2008 – Extend System Volume Error 'The parameter is incorrect'

It's as simple as

DISKPART> select volume #

where # is the number of the affected volume which can be found with list volume.

DISKPART> extend filesystem

Now the file system size should match the new partition size.

  • This worked on a Windows 10 machine. In my case Linux gparted froze during a partition expansion operation and was aborted by powering down the live cd session. After chkdsk corrected issues found the drive size reporting mismatch was the last unsolved puzzle which this resolved.
    – Sn3akyP3t3
    Sep 17, 2017 at 1:09

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