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From: jfm@ruddles.sprl.umich.edu.engin.umich.edu (John F. Mansfield)
Newsgroups: comp.sys.mac
Subject: Re: SE/30s, Superfloppies etc
Message-ID: <4319f2db.a590@mag.engin.umich.edu>
Date: 8 May 89 16:22:00 GMT
References: <3090@tank.uchicago.edu> <13380@dartvax.Dartmouth.EDU>
Sender: root@caen.engin.umich.edu
Reply-To: jfm@ruddles.sprl.umich.edu.UUCP (John F. Mansfield)
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Organization: University of Michigan, Ann Arbor
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In article <13380@dartvax.Dartmouth.EDU> xerox@eleazar.dartmouth.edu (James Osborne) writes:
>
>	Yesterday I joined the few, (the proud?), to own the SE/30, and
>
>To move on to more important things...
>
>What is the deal with this FDHD I have? I work in the computer store at
>the college, with consultants surrounding me, and it wasn't until I went to
>format a disk with my new SE/30 that I learned that you have to buy a different
>kind of diskette to use the 1.4 meg option.  Am I right here?  I can not 
>format a double sided disk as 1.4M? This is the first the store has heard
>of it since we don't even carry HD 3.5 disks.  Ugh!
>


You can actually format a double density or single density disks as
the super density if you fool the computer into thinking they are HD
disks.  They have an extra hole like the erase protection hole on the
opposite edge of the disk to the erase protection shutter.  I made a
hole with a soldering iron, formatted the disk as 1.4M (in fact that
is the only way the Mac will format those types of disk) and then
copied 1.35M of stuff onto it.  It was a single sided disk btw.
I dont know about reliability, I only tried it as an exercise.
If you buy 1.4M disks they can only be formatted as 1.4M.  If you take
an MSDROS disk that has been formatted at 720 with the extra hole the
mac will not recognise it in AppleExchange, if I remember rightly and
will ask to initialise it.
Welcome to the confusion of MSDROS/Mac compatiblity!

PS I was interested to hear about the init that let you mount MSDROS
disks in the finder, it was by Dayna? Is it available ?
Anyone know?

John Mansfield
North Campus Electron Microbeam Analysis Laboratory 2455 Hayward, Ann Arbor,
Michigan 48109-2143. 313-936-3352
Internet: jfm@ruddles.sprl.umich.edu or john_mansfield.um.cc.umich.edu