Abstract: Embodiments of the present invention provide a data storage device and a magnetic disk drive capable of maintaining the inside of a base in a hermetically sealed condition. In one embodiment, a data storage device includes a recording disk, a base having a through hole, a top cover having a tapping hole aligned with the through hole and a depressed portion with the tapping hole formed in a bottom thereof, and a screw inserted through the through hole into threaded engagement with the tapping hole and having a head which comes into close contact with an outer surface of the base. The top cover is fitted inside the base in a state in which the depressed portion is positioned on the base side, and the bottom of the depressed portion comes into close contact with the base in the threadedly engaged state of the screw and in an area which surrounds the through hole.

Abstract: A high-voltage switch circuit includes an enable control circuit, a feedback circuit, a boosting circuit, and a high voltage switch. The enable control circuit precharges an output node to a set voltage in response to an enable signal. The feedback circuit supplies a feedback voltage to an input node in response to a switch control voltage generated from the output node when the output node is precharged. The boosting circuit boosts the feedback voltage and outputs a boosting voltage to the output node, in response to clock signals, thereby increasing the switch control voltage. The high voltage switch is turned on or off in response to the switch control voltage, and is turned on to receive a high voltage and output the received high voltage. The boosting circuit includes an amplification circuit of a cross-coupled type.