IMageDisk Analyzer 1.18 / Mar 12 2012
IMD 1.17:  1/01/1990  0:42:50

XEROX 820-II DS/DD

Required cylinders: 77
Required heads    : 2
Data rate         : 500kbps
Est. maximum track: 8951 bytes

Possible drives/options to write B1D1.IMD :

 3.5" HD 80-track   NOTE: *1 *2
   Double-step: OFF

 5.25" HD 80-track   NOTE: *1
   Double-step: OFF

 8" 77-track
   Double-step: OFF

*1 77 track image likely from 8" drive.
*2 Should fit on 360rpm drive, 300rpm drive will leave long end gap.