From: johnhreinhardt@thereinhardts.org   
      
   On 12/17/2025 6:53 PM, Arne Vajhøj wrote:   
   >   
   > Traditional VMS disk device naming is:   
   >   
   > D = disk   
   > X = controller type, U=Unibus, I=DSSI, K=SCSI   
   > Y = controller number, A=first, B=second, C=third ...   
   > N = unit on controller, either 0=first, 1=second, 2=third ... or 0=first,   
   100=second, 200=third   
   >   
   > RA81's and RA82's become DU disks.   
   >   
   > Google indicate that RA60's become DJ disk. Not sure why. I am not old   
   > enough to know RA60's. Maybe someone else can elaborate on why RA60's   
   > are DJ and not DU.   
   >   
   > Arne   
   >   
      
   Because they were removable pack disks.  I guess DEC decided to make them   
   notable for that and different from the fixed disk DU.   
      
   --   
   John H. Reinhardt   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)