1. It is wearable for user and could be worn on user's wrist.
2. Supports hot insertion-withdrawal.
3. Needs no external power source.
4. Suitable for several operating platforms.
5. Electronic memory medium.
1. Free of mechanical parts. 2. Shock and jam resistant. 3. High write speed. 4. Storing speed about 30 times higher than a floppy disk.