WD external HDs spin down - My Passport -

spin wdAfter about 20 mins the unit did go into standby mode (the front LED changed from a static blue to a slow, pulsating blue and the drive spinning noise was absent). Then, when II am using 2 REDs 8TB of size in my desktop computer which runs 247. Windows 10 does not spin down the drives when set it to so in the energy plan. Basically i want to save