Formatting a Floppy Disk

1. Insert a floppy disk into the disk drive.
2. Touch on the Main screen.
3. Touch to open the Utility screen.
4. Touch . The Disk screen appears.
5. Touch .
6. Touch <2DD> (720 KB) or <2HD> (1.44 MB).
7. Touch .
8. Touch to start formatting.

Source: AT 90s — at-90s-80s-60s-om (manual)