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Check disk size and resize

[root@linux]:/virtual_vm > VBoxManage showhdinfo /virtual_vm/windows8/windows8.vdi 
UUID:           a4fe1112-8d6d-4f49-8e7b-be593f5f9d24
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       /virtual_vm/windows8/windows8.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       40960 MBytes
Size on disk:   35141 MBytes
In use by VMs:  windows8 (UUID: 3615a9f3-fb0a-45ac-b1ad-99853f4ee09f)

[root@linux]:/virtual_vm > VBoxManage modifyhd “/virtual_vm/windows8/windows8.vdi” –resize 81920

Convert a .vdi or .vmdk to something else:

VBoxManage clonehd        <uuid>|<filename> <outputfile>
                          [--format VDI|VMDK|VHD|RAW|<other>]
                          [--variant Standard,Fixed,Split2G,Stream,ESX]
                          [--existing]

[root@linux] /root # VBoxManage clonehd source.vdi target.vmdk --format VMDK 

To preserve your Windows licenses after a clone

[root@linux] /root # VBoxManage showvminfo NomDeLaMachineSource
[root@linux] /root # VBoxManage modifyvm NomMachineCible --hardwareuuid f9c76ae5-044f-49a3-b493-82d859cfbc64