Sunday, February 22, 2026

VirtualBox 7.2.4 - Windows doesn't recognize a (dynamic) .VDI that has an increased max size

VirtualBox + Windows

Situation: You're running out of diskspace in a Windows client. Increasing the size in VirtualBox seems to work, but when you try to use the additional space from within your Windows Guest (via drive management) it doesn't see the larger drive.

This work-around fixes that.


Steps

1. Make sure you're in Expert mode (Files / Preferences)

2. Machines / RMB / Clone

  • tick Full Clone
  • tick Current Machine State
  • tick Keep Disk Names
  • tick Keep Hardware UUIDs

3. Release the newly created .vdi

4. Copy the .vdi using Files / Tools / Media / RMB / Copy

5. Change file size to the new size, leave the rest, Finish

6. Remove and delete the .vdi created in step 3

7. Move the from steps 4 and 5 out of the snapshots folder

8. Machines / RMB / Settings / Storage / Add Attachment

9. Pick the .vdi you just moved

10. Reboot the VM

11. Use disk management or whatever other tool from your Guest OS to use the additional space


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