Windows users can configure this setting in unit Manager.
How to fix it?MiniToolgives solutions in the following content.
Thus, sometimes you cant find the connected external hard drives.

Luckily, you could change the controls by yourself in the unit Manager.
How to disable allow the computer to turn off this rig to save power?
you’re free to follow the next steps to set.
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If you want to enable this option, like try the following methods to fix this problem.
Here we take USB Root Hub as an example:
Step 1: PressWin + Xand selectDevice Managertoopen it.
Step 2: Find and right-punch theUSB Root Hub.

Step 3: ChooseProperties>Details.
Step 4: Change the Property toDriver keyand copy the path under the Value section.
Step 5: PressWin + Rto launch the Run window.

Step 6: Typeregeditin the text box and hitEnter.
Step 7: Find thePnPCapabilitieskey.
If you cant find it, right-opt for right panel and chooseNew>DWORD (32-bit) Value.

Then, rename the new registry key asPnPCapbilities.
Step 8: Double-click this registry key and change the Value data to0.
Step 9: ClickOKand power cycle your machine to apply the changes.
Step 1: PressWin + Rtoopen the Runwindow.
Step 2: Typecmdin the text box and pressShift + Ctrl + Enterto run Command Prompt as administrator.
Step 3: Typemsdt.exe -id DeviceDiagnosticand hitEnterto launch the Hardware and machine troubleshooter.
Step 4: ClickNextand finish with the following instructions.
you’re able to try the free edition to help you at first.