Re: CBM-900 floppy disk format/encoding

From: William Levak <wlevak_at_SDF.ORG>
Date: Wed, 26 Oct 2011 04:19:26 +0000 (UTC)
Message-ID: <Pine.NEB.4.64.1110260415390.16060@sdf.lonestar.org>
On Sat, 22 Oct 2011, Greg King wrote:

> From: "William Levak"; on Sat., October 22, 2011; at 01:11 AM -0400
>>
>
>> On Fri, 21 Oct 2011, Ed Johnson wrote:
>>
>>> I have a SFD 1001 and it used DS/DD diskettes, NOT HD (High Density)
>>> diskettes.
>>
>> The drive mechanism on the SFD 1001 is a Quad Density drive,
>> compatible with DD, but not HD.
>
> "Quad" was a marketting gimmick.  It wasn't related to single- and
> double-density.  It meant that the track density, not the bit density,
> was "doubled".

Quad density has the same capacity as HD, but supports the same magnetic 
coating used in DD, except finer grain particles.  HD uses a magnetic 
coating with a stronger magnetic field, and therefore, not campatible with 
DD.

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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Received on 2011-10-26 05:00:03

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