Last week I bought a thinkpad T430 with a 500GB HDD and added a 128GB SSD to it. Then I installed Ubuntu on the SSD and I'm using it, while there is a Windows8 pre-installed on the HDD and I never used and never will use it. I want to turn the HDD completely off, because when it is turned on, it decreases the battery life and also it makes some noises (standard spinning sound of HDD). I tried removing the related fstab entries, but it doesn't turned off even in the next boot.
Is there any solution to turn off the HDD without opening the laptop and removing it physically?