$ VBoxManage internalcommands createrawvmdk -filename C:\usb.vmdk -rawdisk \\.\PhysicalDrive###
# Disk DescriptorFile
version=1
CID=3f0de8dd
parentCID=ffffffff
createType="fullDevice"
# Extent description
RW 15687680 FLAT "\\.\\physicaldrive2" 0
# The disk Data Base
#DDB
ddb.virtualHWVersion = "4"
ddb.adapterType="ide"
ddb.geometry.cylinders="15563"
ddb.geometry.heads="16"
ddb.geometry.sectors="63"
ddb.uuid.image="d33bac88-5e99-48ba-a270-93c17ff49131"
ddb.uuid.parent="00000000-0000-0000-0000-000000000000"
ddb.uuid.modification="ca836be6-d248-4654-9f23-f6db8891b989"
ddb.uuid.parentmodification="00000000-0000-0000-0000-000000000000"
ddb.geometry.biosCylinders="976"
ddb.geometry.biosHeads="255"
ddb.geometry.biosSectors="63"