It's not. I already explained why. But if you're willing to deal with the 12-bit strangeness, all right... If you don't want to write the code, you can just mount the filesystem and use it...
Floppies use the FAT12 filesystem, which is good at not wasting space, but very hard to use. Its FAT entries are, as the name suggests, twelve bits in size. That's one and a half bytes, like this: ...