ygdimac:~ ygd$ VBoxManage list hdds
UUID: fdad29fc-7497-4daa-824d-c3481644f5a8
Parent UUID: base
State: created
Type: normal (base)
Location: /Users/ygd/VirtualBox VMs/ubuntu/ubuntu.vdi
Storage format: VDI
Capacity: 30720 MBytes
Encryption: disabled
ygdimac:~ ygd$ VBoxManage modifyhd fdad29fc-7497-4daa-824d-c3481644f5a8 --resize 130720
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%