Abstract: An inertia latch mechanism has a latch arm, which latches a head actuator in a retreated position, and an inertia arm, which is rockably supported around a second pivot and rotates the latch arm to a latch position by rotating around the second pivot when subjected to an external force. A voice coil motor has a lower yoke, a top yoke, a voice coil attached to the head actuator and situated between the yokes, and a permanent magnet provided on at least one of the yokes. The top yoke has an arm retaining portion which extends overlapping the second pivot and that part of the inertia arm which is situated near the second pivot and restrains the inertia arm from slipping off the second pivot. The arm retaining portion is stepped to be one level higher than the top yoke.

Abstract: A disk device has a motor provided on a bottom wall of a case. A PCB is located opposite an outer surface of the bottom wall of the case, and an insulation sheet is sandwiched between the outer surface of the bottom wall and the PCB. The insulation sheet has a sheet body formed of an insulator and located opposite the outer surface of the bottom wall and a plurality of damping members provided independently of one another on the sheet body. The damping members include a first damping member situated near the motor and abutting against the PCB and a second damping member abutting against an electronic component mounted on the PCB.

Abstract: In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon detecting the servo mark, the R/W channel detects, from the read information, position information contained in the servo information and following the servo mark, at a timing determined by the detection timing of the servo mark. When the first mode has been switched to a second mode, the R/W channel detects the servo mark and position information using the synchronous method.

Abstract: A nonvolatile memory device includes source and drain regions formed in a semiconductor substrate, and an insulating film formed on a channel region between the source region and the drain region in the semiconductor substrate. The nonvolatile memory device also includes a dielectric film formed above the channel region to store electric charge, and a control gate formed on the dielectric film. Compressive stress in the channel region is equal to or less than 50 MPa.

Abstract: There is disclosed a disk drive using a disk in which servo data is recorded, wherein a CPU executes control to position a head by use of a servo burst calculation result and a difference value from a target cylinder at the time of on-track control in the head positioning control.

Abstract: While using conventional manufacturing processes, it is intended to apply a compressive strain in the channel direction to the p-channel MOS field effect transistor and also apply a tensile strain in the channel direction to the n-channel MOS field effect transistor for increasing both MOS currents. In the MOS semiconductor device isolated by a trench device isolation region, the p-channel MOS field effect transistor is designed so that a length of a source/drain region in the channel direction is not more than 1 micrometer, and the gate length is not more than 0.2 micrometers. The n-channel MOS field effect transistor is designed so that a face of the source/drain region in parallel to the gate width direction is adjacent to the device isolation film with the inserted silicon nitride film, and a face of the source/drain region parallel to the gate length direction is adjacent to the device isolation film comprising the silicon oxide film only.

Abstract: In a first mode, an R/W channel starts to monitor read information to thereby detect a servo mark contained in servo information, each time a servo controller generates a servo gate pulse. Upon detecting the servo mark, the R/W channel detects, from the read information, position information contained in the servo information and following the servo mark, at a timing determined by the detection timing of the servo mark. When the first mode has been switched to a second mode, the R/W channel detects the servo mark and position information using the synchronous method.

Abstract: A programmable controller having a loading feature for changing such control information as control programs. The controller comprises a load execution unit and an allocation unit. The load execution unit checks, upon receipt of new control information, the execution state of the program to be changed based on management information stored in a management table. The load execution unit loads the new control information into an area indicated by addresses held in a management table if the program is in non-executing or non-executable state. The load execution unit loads the new control information into a reserved area indicated by addresses held in a reserved table if the program is in executing or executable state. The allocation unit replaces the content of the addresses held in the management table with the content of the addresses held in the reserved table after the load execution unit has loaded the new control information into the reserved area.