On 01/26/2016 02:48 PM, Eric Smith wrote:
  I was surprised to learn that the 9895, while it
supports standard
 IBM 3740 single-density format, uses an HP-proprietary M2FM
 double-density format. 
So did Intel on the MDS.  I don't recall if there was any significant
difference between Intel and HP MMFM encoding, however.
--Chuck