Apr. 1, 2015. TDK Corporation has announced that its Hong Kong-based HDD head manufacturing wholly owned subsidiary, SAE Magnetics (H.K.) Ltd.
You use a wrench to screw, or unscrew a bolt. A screwdriver is for screws. Either way you turn it left. Some bolts have reverse threads and would turn the other way to unbolt.
Just buy a drill bit that drills into the bolt when your drill is running in the reverse (counterclockwise) direction. That's the normal direction to unscrew a bolt, so you get both a drilling action and an unscrewing action to get the bolt out. I discovered that when I was drilling in the forward direction with a standard drill bit on a reverse threaded bolt.