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.
As the name indicates, a unidirectional bezel is one that rotates in only one direction--counterclockwise. This type of rotating bezel is often used for scuba diving. Prior to submerging, a scuba diver with 45 minutes of air in his tank could turn the bezel so either the zero mark or the 45 mark is showing, depending if it is a count-up or countdown gauge.