Path: utzoo!utgpu!water!watmath!clyde!rutgers!ukma!psuvm.bitnet!ws5
From: WS5@PSUVM.BITNET
Newsgroups: comp.sys.ibm.pc
Subject: Re: Hub ring on HD floppies
Message-ID: <27808WS5@PSUVM>
Date: 16 Dec 87 17:12:49 GMT
References: <415@wa3wbu.UUCP> <450@wb3ffv.UUCP>
     
  Why high capacity disks don't have hub rings (I think):
     
   Since the HD disks contain 80 tracks, the tracks are very thin.  Head
Organization: The Pennsylvania State University - Computation Center
Lines: 7

alignment is much more critical than for standard floppies, and it seems
that the reinforcing ring tends to cause head tracking problems with these
disks, so the manufacturers don't use the ring on the disks.
     
    I read that explanation somewhere a while back, and unfortunately don't
remember where.  Anyway, it seems plausible to me.