| Patent Number |
Title Of Patent |
Date Issued |
| 7242551 |
Method for inspecting track pitch in a magnetic disk |
July 10, 2007 |
| Embodiments of the invention provide techniques to inspect the track pitch of a magnetic disk. In one embodiment, the track pitch is inspected using the servo information that was written onto the magnetic disk. A PES gain is set to be PG0. A head is moved to a position K near the positi |
| 7107510 |
Data storage device and data processing method |
September 12, 2006 |
| The exclusive OR (XOR) of user data (sector) 0, user data (sector) 1 and user data (sector) 2 is taken to have the virtual user data, thereby giving rise to a correlation of the sectors 0 to 2, and its virtual user data is appended with C2 having a greater error correction capability |
| 6654852 |
Method and system of reading and writing data by a disk drive apparatus |
November 25, 2003 |
| The present invention includes a method of reading and writing data on a recording medium, and a system including a disk drive apparatus and a disk drive apparatus controller. According to the method of the present invention, data can be read in the middle of a plurality of write command |
| 6463551 |
Debug circuit and microcomputer incorporating debug circuit |
October 8, 2002 |
| A debug circuit (2) and a microcomputer incorporating the debug circuit (2). The debug circuit (2) is capable of receiving a trace event from a functional block A as long as a CPU (5) does not generate any trace event, and capable of receiving the trace event from the functional block A |
| 6236527 |
Disk drive with actuator load/unload controller |
May 22, 2001 |
| A disk drive with means to prevent accidental landing of a head/slider on the disk surface is described. In one embodiment a shock sensor is provided to sense external shocks received by the mechanism. During loading (positioning) of the actuator bearing the head/slider over the disk |
| 6229663 |
Disk drive loading/unloading apparatus and method for controlling the apparatus |
May 8, 2001 |
| The present invention provides a disk drive, a loading/unloading apparatus, and a method for controlling the apparatus, capable of improving the reliability of data by performing stable speed control. A disk drive comprises a VCM spindle driver for rotating a disk, a magnetic head, an |
| 6108157 |
Head mechanism control apparatus, disk drive, and head unload control method |
August 22, 2000 |
| The invention relates to a head mechanism control apparatus for magnetic recording device which ensures that the transducer head has been unloaded in a head unloading operation. A head slider having a transducer head is mounted on a head arm and is unloaded from the disk by the swinging |
| 5994866 |
Motor controller and disk drive unit |
November 30, 1999 |
| A motor having enhanced transient characteristics during the acceleration time of the motor in a disk unit. The motor includes a motor controller having a phase-locked loop (PLL) or frequency-locked loop (FLL) for controlling the speed of a spindle motor in a disk drive. The PLL or FLL |
| 5812338 |
Method and apparatus for indicating start of servo information on a recording medium |
September 22, 1998 |
| A disk and a disk drive having a servo start mark for identifying a servo-information start position recorded on the disk is provided. The servo start mark has a plurality of bit patterns unused for other areas in servo information. A method for identifying the position of a signal t |
| 5637970 |
Motor speed control apparatus and motor speed control method |
June 10, 1997 |
| A method and apparatus for controlling the speed of a motor for a hard disk drive. The motor speed control apparatus includes a speed feedback controller which uses selected feedback coefficients. The feedback coefficients are suitable to the rotor assemblies having different moments |
