USB Floppy drives and formatting 720K

[RiP]

I have two USB Floppy drives from Sony and IBM.
Both can read 720K floppies but can't format in 720K:
"FORMAT A: /T:80 /N:9"

Any solution? :angry:

[RiP]

Well, lemme update the topic:
My USB floppy drives can't read HD floppy formatted in 720K or format HD floppy in 720K.
But they can read DD floppy formatted in 720K or format DD floppy in 720K.
While my Amiga 2000's floppy drive can format/read HD floppy in 720K mode :angry:

Are the disks 720?
If not have you put a tape to the other hole?

It didn't help.