I bought a nice piece of luggage today, it has a few DEC disks and the CR04 diag cards (Card reader for PDP). But what are the disks? It's about 12-18" across, says decpack, 2200 BPI-12 on it. There's 3, 2 for XXDP+, one scratch. Are these RL02 packs? It's a single platter affair.