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First make sure your external HD is attached. Then find out what device node your HD is. In your case it's /dev/disk2. Umount it with
diskutil umountDisk disk2
and wait until it disappeared from Finder. Change the owner of the device node to your user:
sudo chown `whoami` /dev/disk2
Then create the vmdk:
sudo VBoxManage internalcommands createrawvmdk -filename ~/disk2.vmdk -rawdisk /dev/disk2
Right then attach it to your VM and start it. If you unplug the drive, the ownership and permissions get reset, so you'll have to do the chown step again.
diskutil umountDisk disk2
and wait until it disappeared from Finder. Change the owner of the device node to your user:
sudo chown `whoami` /dev/disk2
Then create the vmdk:
sudo VBoxManage internalcommands createrawvmdk -filename ~/disk2.vmdk -rawdisk /dev/disk2
Right then attach it to your VM and start it. If you unplug the drive, the ownership and permissions get reset, so you'll have to do the chown step again.