You do need to treat the hard file just a real disk, so I don't think it will show up under Workbench until after you've used hdtoolbox to read the drives configuration and write out a RDB. Try executing "SYS:Tools/HDToolBox uaehf.device" from Workbench. Read the config, partition the drive, and save. After that, you should see the new drive(s) in Workbench. Format them and you're done.
