1. Get Disk-ID from Disk Utility.app ("disk1" in my case)
2. Open Terminal
3.Change current directory to:
/Applications/VMware Fusion.app/Contents/Library/
4. Run vmware-rawdiskCreator with the right disk. This will create a new external-hdd.vmdk file in your home folder:
./vmware-rawdiskCreator create /dev/disk1 fullDevice ~/external-hdd ide
5. Open Vm Config file (*.vmx) with TextEdit and add following lines:
ide1:1.present = "TRUE" ide1:1.fileName = "external-hdd.vmdk"
6. save and quit
[via]http://techrem.blogspot.de/2012/12/add-physical-disk-to-vmware-fusion.html[/via]