Ie, set up the new disk as solitary master and run the disk builder image.

Shut down, mount one of the old drives as slave (remember to add/change jumpers if neccessary) and copy the fids across from old to new drive.
Again shut down, replace the slave with the second old drive and repeat the copying of fids to the new drive.
Shut down and remove the old drive, then start again and let the player rebuild the database. Sync to let emplode write the database to disk.

/Michael