If you can’t see your AHCI Link Power Management from the Power Options, there is a way to add it. Always backup your computer before modifying the registry.
You can add the GUID to the registry by going opening the registry (regedit) and creating a key under the following key -0012ee47-9041-4b5d-9b77-535fba8b1442
The easiest way is to copy the information in italics to notepad or notepad++ and save as AHCI.reg.
After saving this, double click on the .reg file and reboot.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlPowerPowerSettings