After the computer restarted automatically, the two disks were gone

My computer. Right Jian. Management Disk Management. Try reassigning the drive letter.

Let's go to safe mode first and see if the disk is on. If it's gone, restore it with the system in the attachment. If it doesn't work. Then install the system. Press F8 to enter safe mode when powered on.

If your system restore is not turned off, you can restore your history

Start - Help & Support - Use System Restore to undo changes to your computer - Restore my computer to an earlier time - Next: Select a time when your system is normal to restore.

The data cable or power cord of the HDD is not in good contact. Reconnect.

In the dual hard drives, one of them will automatically go into hibernation when not used for a long time, and the platter will stop rotating. It will not restart until it is time to read and write the data on it.

However, when the hard disk is hibernating, the drive letter is not lost. You can start by changing the value in the Hard Disk: Settings to 0 in Control Panel => Power Options=> Change Plan Settings=>Change Advanced Power Settings. 0 is never.

The power supply ** is not enough, it is recommended to change the rated power supply of about 300W, and it depends on the model of your graphics card to determine the rated size of the power supply.

Is it that the master-slave disc is not distinguished?

The jumper of the common hard disk should be jumped to the slave disk.

Try a different interface for the hard disk first.

Don't use the same set of power supplies for the two hard drives, try them separately.

It's that your home's AC power is unstable, or the contact resistance of the socket is large, or there is too much interference.

1. Replace high-quality brand power supplies, such as Great Wall, Huntkey, etc., and the filtering of this kind of power supply is better.

2. Check whether your home's power ground wire is good. Urban units and real estate houses are generally fine, but they are afraid that self-built houses are not connected to the protective ground wire in order to save money for power lines. The computer case enclosure is not grounded to shield against external interference.

3. Check that the wall socket where your computer is plugged into is in good contact. If it is an inferior socket, it will also be problematic and cause interference. Check the power strip again or try a good one.

4. Does the computer share a plug-in board with other electrical appliances?

The problem of onboard power supply, find a motherboard and try it.

Is the format of the hard disk in CMOS to AHCI, change it to IDE or try it automatically.