Ummm, a Mac that can natively boot Systems 1, 2, 3, 4, or 6 will also do just fine, didn't mean to imply otherwise. If you've got a bootable diskette that lets you boot the Mac 512, you're already home free. Just tape up those 1.4 meg diskette holes and format away. Not knowing anything about 800K diskettes, your 512 won't offer you options, so any diskette it formats is by definition a 400K diskette.

My prior advice is still relevant if you've got a 512 and no way to boot it. Then you need operating system files and/or diskimages, and a pre-MacOS 8 environment to create the diskettes in.

Final disclaimer: I would not rule out the possibility that Disk Copy under MacOS 8 or 9 would make valid 400K disks from 400K diskimages, it just won't be able to mount the suckers (either as images or as actual disks). I don't KNOW that it can, I'm just not positive that it can't.


At 9:28 PM -0500 3/16/05, Allan Hunter wrote:
At 6:56 PM -0500 3/16/05, Thomas Burns wrote:
I just picked up a Mac 512k that someone was going to turn into a maquarium (heaven forbid).
My question is how do I make a 400k system disk for it? Someone earlier told me you can make 800k disks by putting tape over the hole on regular 1.4mb disks. Is there any way to format a 1.4 as a 400k?

Yes, but you'll need a Mac that can still natively boot System 7.x because beginning with MacOS 8 (if I recall correctly) there's no longer native support for the file system (MFS) that 400K diskettes use.


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Allan Hunter

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