VBoxManage modifyhd XP.vdi --resize 15000

VBoxManage modifyhd XP.vdi --resize 15000
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

That resizes the virtual hard drive image "XP.vdi" to 15000MB instantly.

I doubt this is safe to do while the VM is running and I'm not sure if it would attempt it  still but turn the VM off first to be safe.

I also notice in the VBOX GUI that it still shows the original 10GB size but this will probably update if I close and reopen it (just double clilcking on the storage for that VM will update it).

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