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A Zip 100 Held Roughly 70 Floppies, but Couldn’t Read a Single One
The familiar removable-disk idea concealed a compatibility break that IBM’s manual warned could damage the drive.
A drawer full of floppies could shrink to one Zip cartridge. The ordinary floppy still needed its own drive, which was a fairly important detail before somebody tried to feed it to the new one.
IBM’s internal Zip manual says the drive “does not work with 1.44 MB” diskettes and warns that inserting them can damage it. Similar storage habits did not make the media interchangeable.
The FreeBSD Zip guide describes the 100 MB and 250 MB media families alongside the familiar 1.44 MB floppy. Using the marketed capacity labels, 100 divided by 1.44 is about 69.4. Call that roughly seventy floppies, not a guarantee that every formatted byte maps exactly between them.
| Removable medium | Zip 100 | High-density 3.5-inch floppy |
|---|---|---|
| Marketed capacity | 100 MB | 1.44 MB |
| Required reader | Zip-compatible drive | Floppy drive |
| Works in IBM’s Zip drive | Yes | No; manual warns of damage |
The jump meant a larger project could travel on one cartridge. It also meant the other desk needed a compatible reader.
The next question for a surviving Zip collection is practical: which working reader and second copy will keep those files accessible after this one retires?