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From: bc@mit-amt.MEDIA.MIT.EDU (bill coderre)
Newsgroups: comp.sys.mac
Subject: Re: 512K Mac/800K Drive
Message-ID: <567@mit-amt.MEDIA.MIT.EDU>
Date: Sat, 13-Dec-86 10:44:57 EST
Article-I.D.: mit-amt.567
Posted: Sat Dec 13 10:44:57 1986
Date-Received: Mon, 15-Dec-86 22:47:33 EST
References: <127200001@inmet> <1034@Shasta.STANFORD.EDU>
Organization: MIT Media Lab, Cambridge, MA
Lines: 19
Summary: No, sorry, but wrong

In article <1034@Shasta.STANFORD.EDU>, mrh@Shasta.STANFORD.EDU (Marc Hannah) writes:
> 
> An 800K disk drive will work with 400 K disks exactly like the 400K
> drives if you want it to. 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.
>

Almost, and No.
The 800K drive should work exactly the same as the 400K drive on 400K
disks, but it sometimes has trouble dealing with them. It might be an
alignment problem, but sometimes my old drives read old disks better
than my new drives. This should be no problem if you have a friend
with an external 400K drive. 

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