Actually, if you are going to use a standard 1.44MB floppy drive, you want disks with NOTHING recorded on them, not formatted at all. This is because the read/write head on a true 720K drive is WIDER than the 1.44 head. If you use the preformatted disks, only the middle of the recorded info will get changed. The poor 720K drive will have old tracks mixed together with new ones, likely won't read them at all. I have pulled off this trick myself and sure enough, the 720K disk drive was so confused that it couldn't read it. If you have one of those BIG tape demagnetizers that you used on VHS tapes, etc, use that on the 720K diskettes before writing to them. I turn on the unit about 2 feet away from the diskette, slowly bring it into contact, run it around in a few circles, then pull it away, finally turning it off 2 feet away. I then repeat on the other side of the diskette. This totally erases all prior formatting. If you turn it off while in contact with the diskette, it leaves it strongly magnetized (which you don't want).