I'll post the results here, hopyfully I manage to do this d=)

Ok, partitioned and formatted the 80gb drive according to Roger's guide. Copied everything from the old drives to the new one. I have only the new drive plugged in now, the two old drives are on my desk. All the songs show correctly in the Empeg, plays in the car etc.

Problems:
- Can't access the Empeg via Emplode. Emplode crashes after Rubuilding the databases.
- Everything Empeg is rebooted it will Rebuild the databases. Even incar, takes ~2 minutes... I was wondering if there went something from in the mke2fs -part of the hda4 formatting After the format it said that partition is checked after 30 (or was it 60?) mounts or 180 days, whichever occurs first.

Hints for these issues? Empeg is Mark 1 with 2b13, no Hijack. Emplode is 2.0. Haven't yet tried with my desktop computer, this all was done with the laptop.