Did you actually create "genericdiskname.vmdk" first?
Yeah, the vmdk exists. I created it and then formatted it NTFS with the VMs diskmgmt console and mounted it as a regular disk drive first to make sure the image was functional.
I then just moved it to ehci.
Moderator: Branched to new thread (from a 2 year old thread) in order to move from Workstation Pro to ESXi