From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2006-12-29 07:00:39
On Sat, 23 Dec 2006, Andrew Wiskow wrote:
> Date: Sat, 23 Dec 2006 14:25:24 -0300 (ART)
> From: Andrew Wiskow <drewbrasil@yahoo.com.br>
> Reply-To: cbm-hackers@ling.gu.se
> To: cbm-hackers@ling.gu.se, homestead@videocam.net.au
> Subject: Need "Quad-Density" disks?
>
> I've seen many, many posts on various forums and
> websites about how rare "quad-density" disks are.
> This name is a bit mis-leading, as they are actually
> Double-Sided, Double-Density, 96TPI, as opposed to the
> Double-Sided, Double-Density, 48TPI disks that most of
> us use with our Commodore computers.
Single Density and Double Density are both 48 tpi.
Quad Density and High Density are both 96 tpi.
See www.discinterchange.com/TechTalk_floppy_disks_.html for details.
To confuse things even more, What Commodore calls Single Density is really
Double Density, and what Commodore calls Double Density is really Quad
Density. I at one time had a memo from Commodore explaining this.
The GCR encoding scheme is so reliable that you can use the lower quality
disks. You would never get away with that on any other computer.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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