1, usb power supply is insufficient. The power supply standard of Usb 2.0 is about 5V0.5A The demand for mobile hard disk is 5v0.6a In most cases, the mobile hard disk with the demand of 0.6A can work under the power supply of 0.5A. Many computers have strengthened the power supply of usb, which is slightly higher than 0.5A. Therefore, direct connection to usb is mostly peaceful. However, if it is a front-mounted or usb hub, the power supply may be insufficient due to poor wires or shunt.

2. If it is a desktop, just change the rear interface. If you use usb hub, it is recommended to do independent power supply.

3. It is also possible that the mobile hard disk has been damaged. For example, the hard disk box is damaged, the data cable is damaged or the hard disk itself is damaged. You can judge by substitution one by one.

4. The last possibility is that the usb interface or device is burned. For example, the front usb device of a compatible machine may be burned because of wiring errors. Sometimes usb storage devices are burned. It will also be prompted like this.