... USB external floppy drives 2)Interface:USB 1.1 Type A; 2.0 compatible 3)TEAC,Samsung,Sony etc. drive. 4) ... . 3 inch diskette has a plastic casing, relatively hard, and its role is to protect the inside of ... each 512-byte sector stores. A 1.44M floppy disk, it has 80 tracks, 18 sectors per track, the two ... We can calculate its capacity: 80 × 18 × 2 × 512 ≈ 1440K ≈ 1.44M. The floppy backup data is a good way ...