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[hjalfi]

I have a PowerBook 150. I want to be able to format and use 400kB MFS disks, which it doesn't support. (For testing creation of MFS disks with FluxEngine.)

My understanding is that 400kB disks are physically the same as 800kB disks, just single-sided and with a different filesystem, so adding support ought to be a simple software matter. Does such an extension already exist?

[smilesdavis]

you want https://applesaucefdc.com/ and nothing else

[robespierre]

Try using System 7.1 and selecting "Single Sided" from the Format... dialog.

[Jubadub]

Try using System 7.1 and selecting "Single Sided" from the Format... dialog.

*Like*

System 7.1.2P is the latest version of Mac OS that allows formatting MFS disks. System 7.5 ~ 7.6 can still write data to existing MFS disks, whereas 7.6.1 is able to only read data from them, and starting with Mac OS 8.0, such disks don't even get mounted at all.

Bringing back to Mac OS 9.2.2 what was lost from earlier system versions would definitely be something to try.

Of course, you should be able to use System 7.1.2P (and any other System before Mac OS 7.6) in Mini vMac from Mac OS 9, although I never tried to use Mini vMac to format real floppies or CDs, so I don't know for sure it is able to do that. But you definitely can create MFS disk images from it.