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From: mrh@Shasta.STANFORD.EDU (Marc Hannah)
Newsgroups: comp.sys.mac
Subject: Re: 512K Mac/800K Drive
Message-ID: <1034@Shasta.STANFORD.EDU>
Date: Thu, 11-Dec-86 23:14:57 EST
Article-I.D.: Shasta.1034
Posted: Thu Dec 11 23:14:57 1986
Date-Received: Mon, 15-Dec-86 04:30:44 EST
References: <127200001@inmet>
Organization: Stanford University
Lines: 38

In article <127200001@inmet>, lipsett@inmet.UUCP writes:
> 

> 1.  I understand that I can use the 800K drive as an 800K drive if I
> am running 3.2 and 5.3 with the HD20 file.  But can I use the 800K
> drive as a 400K drive with the old System and Finder files (e.g., as a
> data disk for existing applications in which I might not want to
> replace the system software)?

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.
> 2.  Is there a way to format an 800K disk as an MFS disk?  If so, how
> does this relate to the above question with respect to existing
> applications?  Do I still need the HD20 file and the new system
> software? (BTW, I can't seem to get my 512K to format a single-sided
> disk as HFS no matter what I try - I have tried holding down the
> option key and all that - what am I missing?).

You can format a 800K disk as an MFS disk if you use version 4.1 of
the finder with system 2.0 when you initialize the disk. I'm not sure
whether you can do this with the old ROMS however. In order to use the
800K drive with the old roms,  you MUST have the HD20 file 
on the system disk you boot
up with. The problem here may be that system 2.0 may not allow you
to install HFS in RAM, which is what is happening when you use the HD20
file. It may be that you need the new ROMS with the DS sony driver in
order to use the DS drive AND system 2.0
> 
> 					Roger Lipsett

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