From: Don Maslin <donm(a)cts.com>
 > If the disk is from a MINC-11, then it was almost
definitly running 
RT-11.
   However, I
suspect it was an RX02 drive that it was written in. 
Likely, however, the disk in question is punched as a `flippy' so it is
unlikely that it was written as as RX02. 
 
Rx02 was single sided so flippy is possible.
the real test would be on a rx02!
Allison