The 1040STf shipped with a double-density, 720KB, 3.5-inch disk drive that--thanks to the similarities between the ST's underlying TOS operating system and MS-DOS--could read (but not write) IBM-format disks.
The last letter in the 1040STf name stands for "floppy," denoting the fact that the system shipped with a built-in floppy disk drive. Its predecessor, the 520ST, used an externally attached, 360KB, 3.5-inch floppy drive that increased cable clutter.
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