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From: mir@opera.chorus.fr (Adam Mirowski)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: AT 3 1/2" Floppy question (Is this normal?)
Keywords: IBM AT, 3 1/2", floppy
Message-ID: <8355@chorus.fr>
Date: 13 Mar 91 13:40:20 GMT
References: <9678@exodus.Eng.Sun.COM>
Sender: mir@chorus.fr
Reply-To: mir@opera.chorus.fr (Adam Mirowski)
Organization: Chorus systemes, Saint Quentin en Yvelines, France
Lines: 22

In article <9678@exodus.Eng.Sun.COM>, brada@bardlover.Eng.Sun.COM (Brad Albom) writes:
%% This is probably a simple question, but I just installed
%% a 3 1/2" floppy drive in my AT (sorry, don't remember brand
%% of floppy or controller). It works fine, but it seems that
%% whatever density disk it reads the first time after boot,
%% (1.44Meg or 720Meg) is the only type it will recognize 
%% until I re-boot. That is, if I first read from a 1.44Meg floppy,
%% there is no problem until I put a 720K floppy in. At that
%% point I get the typical, error reading from floppy message.
%% Subsequent read of the 1.44Meg variety still work.

I had this problem when installing a 5.25" drive in my previous computer,
some years ago. The reason was that my drive wasn't configured to signal
a disk change to the computer. I changed the position of a switch on the
drive to DC (Diskette change) and it worked fine.
Later I learned that if you press Ctrl-C or maybe Ctrl-Break at the prompt,
DOS will reread the diskette as if I received a disk change signal.

Of course, it was a 5.25" drive, not a 3.5" one.
-- 
Adam Mirowski,  mir@chorus.fr (FRANCE),  tel. +33 (1) 30-64-82-00 or 74
Chorus systemes, 6, av.Gustave Eiffel, 78182 Saint-Quentin-en-Yvelines CEDEX