• davidgro@lemmy.world
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      6 hours ago

      Very little, around 60k.

      A 1.44 “MB” floppy is 1440k, or about 1.406 real MB, and of that the space used by the FAT file system reduces it to around 1.38 free space.
      For some reason I couldn’t find the exact number and don’t have any handy to check it myself.

      • over_clox@lemmy.world
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        5 hours ago

        The floppy disk format is based on the FAT12 file system.

        https://www.cs.drexel.edu/~johnsojr/2012-13/fall/cs370/resources/UnderstandingFAT12.pdf

        And with enough creative tweaks to that file system, you can get DMF 1.68MB format, and if you think a bit outside the box and erase the redundant secondary FAT table and settle on a max of only 16 files on the disk, you can squeeze a few more kilobytes out of that even.

        I actually made a number of custom modded blank disk images with more storage space, I might dig out the full specs of all the variants later.