Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!psuvax1!psuvm!cunyvm!uupsi!sunic!tut!hydra!hylka!jlaiho
From: jlaiho@cc.helsinki.fi
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: 3.5" 720K format information wanted
Message-ID: <2809.26acc499@cc.helsinki.fi>
Date: 24 Jul 90 21:58:49 GMT
References: <1990Jul24.000651.7447@Solbourne.COM>
Organization: University of Helsinki
Lines: 24

In article <1990Jul24.000651.7447@Solbourne.COM>, imp@dancer.Solbourne.COM (Warner Losh) writes:
> Greetings all,
>
> 	I'd like to get information on how 720K disks are formatted on an
> IBM PC when they are DD.  I already know what the layout of the disks are, but
> I haven't seen a good explination of the logical sector to physical "track,
> head,sector" mapping.  Also, how are the tracks numbered.  How is this
> different than 5.25" floppies?
>
I don't remember these thing by heart, but I recall there is a program
called FDFORMAT, FDFORM15 or something similar. Anyway the program is an
enhanced floppy formatter that allows one to make greater capacity
diskettes than normal DOS would allow. The distribution package includes
TP5.5 source code. Unfortunately for me the source was commented in
German, so I could not read the functions of the program from comments;
I had to read the code..:-)
This program also formats normal capacity DOS disks using it's own
procedures. I think it will have all the information you need included.

> Warner Losh		imp@Solbourne.COM
> Boycott Lotus.		#include <std/disclaimer>

Juha Laiho
jlaiho@cc.Helsinki.FI