What if the win10 hard drive does not recognize? Win10 does not recognize the hard disk solution

        Win10 hard disk can not identify how to do? The following will introduce you win10 can not identify the hard disk solution, if you have encountered the same problem after upgrading Windows10 preview version 9879, may wish to refer to the following to operate.
After Microsoft's push preview version of Win10 Build 9879 was updated, many users reported that the hard disk could not recognize the fault, and many users solved this problem temporarily by installing Intel RST driver and Linux image recovery. However, the solution is not the focus of this article. Below, IT House will explain why Win10 Build 9879 does not recognize the hard disk.
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.
Once the hard drive enters the on-demand boot state, the hard drive 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.

Windows10 preview version every time you start, will open PUIS mode. 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.