VBoxManage modifyhd MYHD.vdi --resize 20000
Were 20000 is more or less 20 GB.
If the command fails several reasons could be the cause.
- The virtual disk is already larger. Till now you cannot shrink drives that way. Take a close look in the VM whether you already use that space actually. In Windows this information is under Computer Management --> Storage --> Disk Management
- The virtual disk has the wrong type. Issue the command:
VBoxManage showhdinfo MYHD.vdi
If the result is not:
Format variant: dynamic default
you have to migrate your disk to that dynamic system. Since this is the default container for newer versions you can simply clone your HD file and then enlarge the new one:
VBoxManage clonehd MYHD.vdi MYNEWHD.vdi
- I did not encounter other errors, please comment if you have any problem and/or solution
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