I added a SATA hard drive to the host system, set it offline, and attached it to the VM SCSI Controller as a Physical hard disk. After starting the VM, I assigned a drive letter and copied files from the hard drive, then shut down the VM and the host, then removed the hard drive from the host. Now the VM will not start with error: Synthetic SCSI Controller (....): Failed to restore with Error 'The system cannot find the file specified'.
In the VM Settings, the missing Hard Drive is listed as Physical drive Not found. I cannot find any way to delete this missing hard drive from the SCSI controller - the Remove button is grayed out.