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From: groenewo@fwi.uva.nl (Ferry van het Groenewoud)
Newsgroups: comp.sys.amiga.emulations,comp.sys.amiga.hardware
Subject: Re: A3000 high density floppy drive with AMAX support!
Message-ID: <1991Mar29.172513.1439@fwi.uva.nl>
Date: 29 Mar 91 17:25:13 GMT
References: <1991Mar22.214507.10761@en.ecn.purdue.edu> <1991Mar23.150300.6691@grebyn.com> <1006@cbmger.UUCP> <1991Mar27.141826.11339@fwi.uva.nl> <1026@cbmger.UUCP>
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peterk@cbmger.UUCP (Peter Kittel GERMANY) writes:

>In article <1991Mar27.141826.11339@fwi.uva.nl> groenewo@fwi.uva.nl (Ferry van het Groenewoud) writes:

>>Will it be able to format DD disks with HD capacity (ie. will it look for
>>the hole in HD disks or not? I hope it won't).

>No, you definitely need HD disks. DD's really can't hold that much of
>data, else this would have been common for some years already.

I disagree. It IS common practice here to make a hole in a DD disk
so that a HD drive thinks the DD disk is a HD disk. I know some guys 
that do this. It turned out that it was even possible to use DD white
label disks (very cheap disks) and format them HD.
It reminds me of the good old C64 time. Noone ever bought double sided
disks, just single sided. Make a hole in it and use it double-sided.
I NEVER have had problems.
So let there be a little switch on the drive to turn out the checking.

Michael van Elst wrote to me:

|The Mac doesn't write its 400k and 800k disks in a constant density.
|one would need more than two different motor speeds to adapt the Amiga
|disk controller to that format.
|Nevertheless, then Mac can use 1.44M disk (using a constant density)
|and these disks can be written by the Amiga hardware. It's a matter
|of software then to format the disks.
|The HD-drive can read/write normal 880k amiga floppies and it uses
|two drive speeds to achieve that. But the exactly two different speeds
|are different from what you need for the Mac 800k format.
|
|Regards,
|					Michael van Elst

Maybe this clears up things a little (thanks Michael).

>-- 
>Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
>Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk

--
Mac.   The noise of a wrong calibration.    PS/2.  You can't see the new thing.
IBM.   The toys of a dead generation.       Sun.   You can't feel the beating.
NeXT.  The choice cause of bad information. Atari. You'll need some healing.
                                           
Amiga. For boys with real imagination.  __  Amiga. You can reach the ceiling.
                                     __/ /
Ferry van het Groenewoud             \__/  groenewo@fwi.uva.nl