I've set "Turn off hard disk after" value in the Power Options. But when I open my HDD in the File Explorer it happens instantly that's why I'm not sure if it's actually on or off at the moment. Please tell me if it's possible to somehow figure it out.
P.S. Some people think that's a bad idea to shut down HDDs because it'll trash their heads. My HDD is used only from time to time during the backups while my PC is turned on most of the time.