Format Floppy Disk

1. From the Disk Browser, select the floppy drive.
2. Press the Utilities function key (F1).
3. Press the Format function key (F3).
4. Insert a floppy disk.
5. Press OK to format.
6. Formatting takes about a minute and a half.

Source: E4K — e-mu-emulator-4k-manual (manual)