Date   : Fri, 14 Jun 1991 03:17:56 GMT
From   : prism!mailer.cc.fsu.edu!loligo!swanson@gatech.edu (Bob Swanson)
Subject: Re: Help needed: Compupro 8/16 running concurrent cp/m

Been some time since I played with 8" disks, but I seem to recall that
the sector index hole is in a different spot on double sided disks.  That's
how your box "knows" it's being fed single sided disks.