yes - if you have a full diskimage such as you would create with Linux
dd if=/dev/hda of=ide-laptop-disk.img
you can use this as athe flat-vmdk for a vmdk type monolithicFlat.
All you need is to create the vmdk descriptor-file.
I have explained this here:
http://sanbarrow.com/vmdk-howtos.html#calcgeoexample