Date   : Mon, 15 Sep 1986 07:23:00 PDT
From   : Voorheis.es@xerox.ARPA
Subject: Re: AMPRO MULTIFMT utility

A 96 tpi drive requires a floppy disk designed for 96 tpi (called high
density).  You can format a high density disk to 48 tpi but only on a 96
tpi drive.  Subsequent writes on a 48 tpi drive will be unreliable.