Before I begin -- yes, it is VDI disk, yes, it is dynamic, and yes -- I try to increase the size of it. So 3 common mistakes are avoided by me.
The disk is 40GB now, I would like to make it 80GB.
So far I tried VB 4.1, when using it I had to use UUID to specify the disk, because I used filename VB claimed the disk is already in use. However even with UUID the result was an error "Resize hard disk operation for this format is not implemented yet".
Then I tried VB 4.2 (the latest one), now the error message changed to "The given path 'here goes UUID' is not fully qualified".
I also tried to do the resizing from root account, no success.
I call VB like thise:
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VBoxManage modifyhd UUID_of_the_VDI_disk --resize 80000
So how to resize it?