On Tue, 20 Feb 2001, Bob Nestor wrote:

> There's a paper that was written a couple of years ago by an Apple 
> Engineer which describes how to make a disk useable under both MacOS and 
> MSDOS/Windows.  If you search around the internet you may still be able 
> to find it.  Basically the disk mapping schemes used on both systems can 
> occupy the same block on disk (Block 0).  Then all that needs to be done 
> is to reserve the area used by MSDOS as a non-standard Apple partition 
> type in the Apple Disk Partition Map and do the same for the Apple used 
> areas in the fdisk map.  One could map a common part of the disk in both 
> maps, although I'm not quite sure how the systems would deal with the 
> byte order of the data in that area.  Making the disk bootable on both 
> systems may be a bit of a strech though.

This works. The problem is that the original poster wanted the same
filesystem usable by both OSs, while the technique you mention above has a
MacOS and an MSDOS area.

This method is how Iomega Zip Tools disks were made when I bought mine.
Not sure if they still do it this way.

Take care,

Bill