Try this vmdk descriptorfile: - fix name of the flat.vmdk
# Disk DescriptorFile
version=1
CID=fffffffe
parentCID=ffffffff
createType="monolithicFlat"
# Extent description
RW 21610496 FLAT "test-flat.vmdk" 0
# The Disk Data Base
#DDB
ddb.virtualHWVersion = "8"