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.
I can unscrew the knob a ways and see a pin that won't come all the way out (see top of picture). The other side has a hole where a screw driver can be inserted to unlock the doorknob, it will also unscrew a ways. It is an interior lock.