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From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Diff between 720K, 1.2M floppies?
Message-ID: <5911@steinmetz.steinmetz.UUCP>
Date: Fri, 1-May-87 12:48:53 EDT
Article-I.D.: steinmet.5911
Posted: Fri May  1 12:48:53 1987
Date-Received: Sun, 3-May-87 05:38:53 EDT
References: <1597@ihuxm.ATT.COM>
Reply-To: davidsen@kbsvax.steinmetz.UUCP (William E. Davidsen Jr)
Organization: General Electric CRD, Schenectady, NY
Lines: 24

In article <1597@ihuxm.ATT.COM> edw@ihuxm.ATT.COM (Ed Windes) writes:
>I have a Teac FD-55FV-13-U,  5-1/4", 96tpi floppy drive.
>I am using it in a PC clone as a 720K drive.
>
>What is the difference between this drive and an 1.2M AT drive?
>The pidgin English document included with my drive covers the
>...

To use a 96 tpi drive for 1200k you need three things: the right
controller, the right software, and the special speed drive.

The 1200k drives turn at 360 rpm rather than 300, and have a
transfer rate of 500k rather than 250. If this sounds just like
an 8" disk drive, it is. I'm told that a standard AT controller
will run an 8" drive with a little diddling of cables. I suspect
that you are lacking some (or all) of the requirements. People
with 1200k drive can run 720k on cheap floppies, however, which
is a much lower cost per byte than the 1200k.

-- 
bill davidsen			sixhub \	ARPA: wedu@ge-crd.arpa
      ihnp4!seismo!rochester!steinmetz ->  crdos1!davidsen
				chinet /
"Stupidity, like virtue, is its own reward"