Don't forget NeXT computers… On all NeXTstations (and NeXTcubes with internal floppy drive), the drive is a Extended Density 2.88MB floppy drive.The one in 'stations and 'cubes supports reading NeXT, Mac, and DOS formats. From what I understand, most NeXT software came on ED floppies…

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I can confirm from direct testing that a NeXTstation will read and write 2.8 MB floppy disks in NeXT format only. It is impossible to format a 2.8 MB disk in HFS (since there is no Mac-compatible 2.8 MB drive,) and NeXTstep does not read, write, or format FAT12 (DOS) at 2.8 MB. It can read and write 1.4 MB FAT12 disks just fine, though.

Neither can a PC with a 2.8 MB drive read or write a NeXT-formatted 2.8 MB disk. (I have a couple PS/2s with 2.8 MB drives, plus the NeXTstation, and a few 2.8 MB 'ED' disks.)

If you have a PS/2, though, you can have fun with the old DOS program 2M, which can format an ED disk to fit just shy of 4 MB...