[convFixb]

Note: There’s a gotcha when using it in multi-user environments (like a server).

Users with Administrator access do not have permission to enumerate directories / files inside other Admin users home directories. So any per-user files are not counted in this scenario.

Source: ‘The mysterious case of the Windows server with a full disk but WinDirStat shows it as only half-full’ :-)

[justsomehnguy]

Yes, that's why WinDirStat is a no go at all.

Use WizTree, or any other util what reads NTFS MFT directly.

[Dylan16807]

It can't get to all the files even for a single admin user, you need to do something like run it as system with psexec.