1. Right-click "Calculation", select "Properties", find the offline hard disk in the hard disk management and double-click it. If "Online" is available, just double-click "Online". If it still cannot run normally after being "online", open the computer menu bar and run it as an administrator. If the prompt is "CMD", just run diskpart.

2. Then enter the "select disk" command to perform disk repair. Special attention needs to be paid here. Select the disk with the words "select disk". Don't choose the wrong one.

3. Run uniqueid disk to display the disk ID. After obtaining the disk ID, you can use unique labels to distinguish them to avoid conflicts, and then run the command uniqueid disk ID=348ADE2A.

4. Finally, you need to unplug the USB flash drive and reconnect it. I would like to remind you that you must not replace the system hard disk to start the disk ID, otherwise you will be unable to boot. If an offline situation occurs, it is usually because of a disk ID conflict, which can basically be solved by modifying the ID.