On 04.03.2014 15:11, Al Kossow wrote: > > I noticed that the first track is very different, with very long sectors > compared to the > rest of the disk. The microcode diskettes for system/32, /34 and /36 used one 4 KByte sector on track zero for IPL. S/36 had programs DIAGINIT and DIAGCOPY which could format and make copies of the S/36 microcode diskettes.