A 1.44MB 3.5” DS HD floppy disk is 1,474,560 bytes when formatted. (2MB 

It used 512 byte sectors, 18 sectors per track, 80 tracks per side and is/was a 
two sided media.

512 * 18 * 80 * 2 = 1474560 / 1024 = 1.44MB floppy.

More information on this can be found at 

Also, on Mac, Unix and Linux dd will write the disk image fine with a command 

sudo dd if=FD12FLOPPY.img of=/dev/fd0

(or similar)

As a side note, PC-DOS 7 used oddly formatted diskettes for its install media. 
These provided a capacity lager than 1.44MB on its 3.5” install media. This was 
good to reduce the number of diskettes required. But, it made it more difficult 
to clone the original floppy disks for backup purposes. Also, it was not 100% 
compatible with all floppy drives and could cause other headaches as well.

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