# make
# make load
/sbin/kldload -v /usr/home/butcher/work/vbox/mod/geom_vdi.ko
Loaded /usr/home/butcher/work/vbox/mod/geom_vdi.ko, id=5
# sysctl debug.bootverbose=1
debug.bootverbose: 0 -> 1
# mdconfig -f 10G_GPT_UFS.vdi
md0
GEOM_VDI: valid signature detected.
GEOM_VDI: Provider md0.vdi created.
# gpart show md0.vdi
=> 34 20971453 md0.vdi GPT (10G)
34 256 1 freebsd-boot (128k)
290 2097152 2 freebsd-swap (1.0G)
2097442 4194304 3 freebsd-ufs (2.0G)
6291746 14679741 4 freebsd-ufs (7G)
# geom vdi list
Geom name: md0.vdi
dataoffset: 41472
blocksoffset: 512
blockscount: 10240
blocksize: 1048576
mediasize: 10737418240
Providers:
1. Name: md0.vdi
Mediasize: 10737418240 (10G)
Sectorsize: 512
Mode: r0w0e0
Consumers:
1. Name: md0
Mediasize: 468754944 (447M)
Sectorsize: 512
Mode: r0w0e0