Common wisdom (at least in my head) was that an older Mac with OS support for 400k disk formatting was needed. Even before that, they dropped direct OS support for formatting floppy disks as 400k MFS. In the process of helping out a fellow Macintosh hobbyist make a startup disk for his original 512k Fat Mac, to my surprise i learned, or was reminded, that Disk Copy can make 400k MFS format boot floppy disks from a valid bootable 400k MFS disk image… even on OS 8 or 9! This may be of interest to owners of original 128k and 512k Macs with the original 64k ROMs.Īs discussed in my Working with Macintosh Floppy Disks in the New Millennium article, Apple dropped OS support for MFS disks as of OS 8.0. Making a 400k MFS Boot Floppy on Any Beige Mac
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