Oh.. ya know, the way to do this is to run the builder image on the empeg first, then pull the drives and take them to a PC for the time-consuming data copy phase. The empeg can then run on the old drives while this happens.
Yes, that thing would work. Make sure to use Mark Lord's builders with the drives in the player, remember to put the player software back onto the player and the disks while they are still in the player after the build (using Mark's installer), and *then* hook the disks up to the PC to copy the files.
Of course, you can't just "copy the files" as raw MP3s; you have to use a
FID generator program on the PC and then copy the resulting
FID files to the player's drives.