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From: jcav@quads.uchicago.edu (john  cavallino)
Newsgroups: comp.sys.mac.misc
Subject: Re: Using 400K disks w/System 7 (was: Re: THE most subtle change in System 7)
Message-ID: <1991May30.185340.21348@midway.uchicago.edu>
Date: 30 May 91 18:53:40 GMT
References: <1991May29.040751.5773@rs6000.cmp.ilstu.edu> <1337@duteca.UUCP>
Sender: news@midway.uchicago.edu (NewsMistress)
Organization: University of Chicago
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In article <1337@duteca.UUCP> thomas@duteca (Thomas Okken) writes:
>In fact, you can still use 400K disks IF they have an HFS directory. To get
>this, hold down Option, select Erase Disk from the Special menu, keep the
>Option key down until the formatting is completely finished, that is, until
>the alert box disappears.
>You then have an HFS disk, with fully functional folders (the kind that
>actually shows up in the Standard File dialogs). And this disk can be read
>by *any* Mac, including the 128K (if running System 3.2 or higher).

Total nit-pick, but the Mac 128 can't run System 3.2 (not enough memory).
In fact, neither the 128 nor the original 512 can understand HFS, no matter
what the system version.  HFS capability can be added to the original 512
if the startup disk contains the "Hard Disk 20" INIT file (did you know
that this was the VERY FIRST INIT file?), which loads an early version of
HFS into RAM.  Everything from the 512E onward had HFS in the ROM.

What bugs me about System 7 and MFS is that they apparently didn't modify
the disk init package to disallow the creation of MFS-format disks.  Both
the single-side and double-side buttons should created HFS directories.

-- 
John Cavallino                      |     EMail: jcav@midway.uchicago.edu
University of Chicago Hospitals     |    USMail: 5841 S. Maryland Ave, Box 145
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