After Win10 upgrade, how can I solve the hard disk?

A lot of users responded that there was no problem with the computer, but after they upgraded Win10, there was a problem that the hard disk could not be recognized. What happened? How to solve the hard disk after Win10 upgrade?

Some people by installing the Intel RST driver, Linux mirroring recover temporary solution to this problem. However, the solution is not the focus of this article. If you encounter the same problem after upgrading Win10, you may wish to refer to the following.

Cause Analysis

PUIS (Power-up in standby), the hard disk will enter standby mode, and when the ATA command is received, the rotation will be started to achieve maximum energy saving.

The PUIS mode is turned on every time the Windows 10 Preview is launched. Need to be reminded that some hard drive manufacturers have blocked this feature and will not be affected by this. IDE mode does not support on-demand booting and will not be affected by this. As for the Linux image, the repair process will turn off the on-demand boot (PUIS) state, and some hard disks may still be affected again after the power is turned off.

Solution

Once the hard disk enters the on-demand boot state, the hard disk will no longer respond to the power/hardware/operating system boot request. If you need to re-enable the hard disk, you need to first send the Set Feature command through the ATA standard interface. The command is 0xEF, and then you can call the 0x86 command to turn off the PUIS state. Or call 0x07 to instruct the hard disk to spin start when receiving power supply.

The above is the introduction of Win10 after the upgrade can not identify the hard disk, it should be said that this is a more common problem, so the follow-up Win10 version will fix this vulnerability.