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From: mrh@Shasta.STANFORD.EDU (Marc Hannah)
Newsgroups: comp.sys.mac
Subject: Re: 512K Mac/800K Drive
Message-ID: <1059@Shasta.STANFORD.EDU>
Date: Thu, 18-Dec-86 14:02:04 EST
Article-I.D.: Shasta.1059
Posted: Thu Dec 18 14:02:04 1986
Date-Received: Fri, 19-Dec-86 01:38:03 EST
References: <127200001@inmet> <1034@Shasta.STANFORD.EDU> <480@gumby.WISC.EDU>
Organization: Stanford University
Lines: 45
Summary: 800K MFS disks

In article <480@gumby.WISC.EDU>, bezanson@gumby.WISC.EDU (Brian Bezanson) writes:
> In article <567@mit-amt.MEDIA.MIT.EDU>, bc@mit-amt.MEDIA.MIT.EDU (bill coderre) writes:
> > In article <1034@Shasta.STANFORD.EDU>, mrh@Shasta.STANFORD.EDU (Marc Hannah) writes:
> > > ... If you are worried about compatibility however,
> > > you can format an 800K disk as an MFS disk and you will have the extra
> > > space in addition to compatibility.
> 
> > There is no way that I know of to make an 800K MFS disk. I wanted this
> > to happen pretty badly for a certain application, but NOOOOO.
>  
> > If there is a way, please post it. I'm willing to be proven wrong!....bc
> 
> Well I hope this will help.  The MacServe manager has several formatting
> options for hard disks, floppies, and it's partitions.  It allows you
>...
> Another way (I haven't actually tried this), is to format a standard 800K HFS
> floppy.  Then reboot with an old system/finder (<3.0/5.0).  Now reformat
> you 800K disk under the old MFS system.
> -- 
> Brian Bezanson {seismo,ihnp4,allegra,topaz,harvard}!uwvax!gumby!bezanson
> Manta Software Corp.				  bezanson@gumby.wisc.edu 

    I guess I don't understand what the hassle is. I have done the following
and it will DEFINATELY work on a Mac which has the new ROMS and the 800K
disk drive. Use System 2.0, Finder 4.1  to initialize a NEW (or previously
used) disk in the 800K drive. The resulting disk will be an MFS 800K disk.
    What I don't know and you will have to try is whether this trick will
work on a Mac with the old roms. The problem is this...in order to use
the 800K drive you need the new Sony driver which is contained in the new
ROMS and is in the HD20 file which people with the 64K roms use to run HFS
and use the 800K diskdrive. 
  The HD20 file loads the new driver AND HFS if it is on a disk with system
>3.0. I don't know what happens if you try to use it with system 2.0. You 
should just try it. 
  So try this to get an 800K MFS disk if you have the old ROMS: Put system
2.0, Finder 4.1, and the HD20 file (Hard Disk 20 file which you use to
startup your system with the 800K external drive) onto a 400K MFS floppy
disk. Start up the system with that disk. Initialize a disk in your 800K
drive. Is it 800K or 400K or is it usable at all?
David Gelphman                  BITNET address: DAVEG@SLACVM
Bin #88 SLAC                    ARPANET address:  DAVEG@SLACVM.BITNET
Stanford, Calif. 94305          UUCP address: ...psuvax1!daveg%slacvm.bitnet
415-854-3300 x2538
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