以下作業メモ

$ diskutil mount disk0s4
$ sudo chmod 666 /dev/disk0s4
$ ls -l /dev/disk0*
brw-r----- 1 root operator 14, 0 2 24 2011 /dev/disk0
brw-r----- 1 root operator 14, 1 2 24 2011 /dev/disk0s1
brw-r----- 1 root operator 14, 2 2 24 2011 /dev/disk0s2
brw-r----- 1 root operator 14, 4 2 24 2011 /dev/disk0s3
brw-rw-rw- 1 root operator 14, 3 2 23 20:51 /dev/disk0s4

$ sudo VBoxManage internalcommands listpartitions -rawdisk /dev/disk0
Password:
Number Type StartCHS EndCHS Size (MiB) Start (Sect)
1 0xee 1023/254/63 1023/254/63 200 1
2 0xaf 1023/254/63 1023/254/63 151936 409640
3 0xaf 1023/254/63 1023/254/63 303616 311837384
4 0x07 1023/254/63 1023/254/63 20931 933906432
$ sudo VBoxManage internalcommands createrawvmdk -rawdisk /dev/disk0 -filename win7raw4.vmdk -partitions 4