Mobile hard disk mainly refers to a small and portable hard disk memory that uses USB or IEEE1394 interface, which can be plugged in or out at any time, and can transmit data to the system at a high speed. On products with USB1.1 interface specifications, it takes a long time to transmit a large amount of data. The USB2.0, IEEE1394, and cSATA mobile hard disk interfaces are relatively better. The USB 2.0 interface transfer rate is 60MB/s, the USB 3.0 interface transfer rate is 625 MB/s, and the IEEE 1394 interface transfer rate is 50 to 100 MB/s. Advantages of mobile hard disk: large capacity; good compatibility, plug and play; fast speed; small size and quality; safe and reliable