By the time you take the drive out of the Mac (unscrew from carrier etc), dismantle external case... put drive in case, assemble case... do the file copy... reverse all of the above... no. Usually quicker to do in the Mac. Particularly with LCs (volume selling machines in the day), you could usually just unclip the hard drive, swing it up with cables still connected and access the SCSI ID jumpers without unbolting the drive from its carrier.