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It really has more to do with the physical width of the read-write heads on a 1.44Mb drive .vs. a 720Mb drive. The track width of the read-write head is much narrower on a 1.44Mb drive than it is on a 720Mb drive. When using a 1.44Mb formatted diskette on a 720Mb drive, this typically has the effect of causing the previously written data (or noise) to show up on either side of the formatted track. This issue will cause read problems for the drive controller. For best results, you should always try to format the diskette using the type of drive in which it's to be used. Barring that, the diskette being used should be either a new un-formatted diskette, or should be bulk erased to remove any previous data prior to use.

All the best,
Bill W4WHW