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| Number | Title | Issue Date |
| 7511915 | Method, system, and program for storing data in a storage medium Provided are a method, system, and article of manufacture for writing data in a tape medium having wraps. A layout of the tape is provided including at least one segment within a full length of first set of wraps for writing user data and at least one segment within... | 03/31/2009 |
| 7511912 | Writing multiple servo sector patterns to improve servo sector alignment on multiple surfaces Method and apparatus for certifying servo sectors on recording surfaces of a disc stack of a data storage device to promote servo sector alignment among the various recording surfaces. A reference servo sector pattern is written to a first recording surface, the ref... | 03/31/2009 |
| 7511913 | Stable time domain radial self-servo write propagation Embodiments of the present invention provide an approach in the time domain, instead of the frequency domain, for analyzing and correcting for radial propagation instability in servo-writing. In one embodiment, a system for controlling a read/write head of a disk dr... | 03/31/2009 |
| 7508616 | Regulating data writes responsive to head fly height Write commands through a read/write head are regulated in response to head fly height. The head fly height is determined, and the rate at which the write command is carried out is regulated in response to the determined fly height. The rate may be regulated by inser... | 03/24/2009 |
| 7508615 | Method of controlling movement of a transducer and disk drive using same A method and apparatus for controlling movement of a transducer to limit its stopping time at a certain position of a disk regardless of whether the disk drive performs a read/write operation, an etching or clustering effect of a lube layer coated on the disk is pre... | 03/24/2009 |
| 7508618 | Multivariate head-to-disk contact detection Magnetic disk drive systems and associated methods are described for precisely detecting contact of read/write elements of a recording head with a magnetic disk due to increasing a heating power applied to heating elements in the recording head. Contact is detected ... | 03/24/2009 |
| 7508617 | Fly height compensation using read gain control loop Apparatus and methods are disclosed that regulate head fly height so as to compensate for variation in height of a disk surface. An exemplary apparatus includes a circuit that detects disk height variation in response to variation in the gain of a variable gain ampl... | 03/24/2009 |
| 7505222 | Algorithm to detect the touch down of the flying head on disk A disk drive that contains a fly on demand head (FOD) and a process for determining contact between the FOD head and a disk. The head includes a heating coil that can receive various levels of power. The process may include a routine to determine head position estim... | 03/17/2009 |
| 7505223 | Compensating for non-linear thermal expansion when writing spiral tracks to a disk of a disk drive A method of writing spiral tracks for a disk drive is disclosed. A first concentric reference track is written at a first radial location near an outer diameter of a disk surface, a second concentric reference track is written at a second radial location near an inn... | 03/17/2009 |
| 7502193 | Positioning of a magnetic head in a magnetic data recording device using a multiple sensor array A system method and apparatus for determining a position error signal (PES) for servo tracking in a data recording system using a data track. The PES is determined using a sensor array that includes a plurality of sensors offset from one another by certain predeterm... | 03/10/2009 |
| 7502192 | Magnetic disk drive and method for efficiently determining and storing RRO compensation values using a secondary micro-actuator A method is disclosed for efficiently determining and writing repeatable runout (RRO) compensation value sets for data tracks on a magnetic disk in a disk drive. The disk drive has a magnetoresistive (MR) head having a read element and a separate write element, and ... | 03/10/2009 |
| 7502195 | Compensating for thermal expansion when writing spiral tracks to a disk of a disk drive A method is disclosed for writing M spiral tracks (i=1 to M) to a disk of a disk drive. A head is positioned over a first radial location to write a concentric reference track comprising N concentric servo sectors. Prior to writing one of the spiral tracks, the conc... | 03/10/2009 |
| 7502196 | Head actuator design for a low profile tape drive A head actuator design for a low profile tape drive is configured with a damping system for a head suspension system having flexure springs to accommodate a half-high form factor. The damping system employs hall sensors, for example, mounted on the head carriage tha... | 03/10/2009 |
| 7502194 | Head-disc contact detection using a microactuator A method for detecting head-disc contact in a disc drive is disclosed. The method comprises monitoring an output signal from a head positioning microactuator on a read/write head in the disc drive and evaluating the output signal to determine if the read/write head ... | 03/10/2009 |
| 7502191 | Method and apparatus reducing off track head motion due to disk vibration in a hard disk drive through the head gimbal assembly An improved and distinctive servo-controller scheme resulting in an overall improvement in PES performance, particularly when applied to hard disk drives employing the invention's TMR reduction mechanisms. The servo-controllers trade off gain in the disk vibration f... | 03/10/2009 |
| 7499235 | Auto-servo tape system and associated recording head A recording head comprises a first tape-head contact area including a first write element and a first read element, which itself may include an MR sensor element. The first read element is laterally offset as to the first write element, and no portion of the first r... | 03/03/2009 |
| 7499237 | Recording controlling method in hard disk drive and hard disk drive using the same A method of controlling recording and a hard disk drive (HDD) using the same. The HDD has heads in which a write head and a read head are spaced apart from each other by a predetermined gap in a track direction, and the method includes: reading a table having a head... | 03/03/2009 |
| 7499236 | Calibrating correlation between PES and off-track displacement by processing high frequency signal in spiral track A method is disclosed for writing product servo sectors to the disk of a disk drive by demodulating spiral tracks recorded on the disk. Each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. The high frequency sig... | 03/03/2009 |
| 7499238 | Systems and methods for improving disk drive synchronization Various systems and methods for providing head location feedback are disclosed herein. For example, one system includes an interface circuit that is operable to receive an information stream retrieved from a magnetic storage medium. The magnetic storage medium inclu... | 03/03/2009 |
| 7499234 | Method and apparatus for modifying spiral profile using reference tracks written onto a disk surface of a disk drive The present invention is directed to a method and apparatus for modifying a spiral profile using reference tracks written onto a disk surface of a disk drive. In one embodiment, a disk drive includes a disk surface having both a read head and a write head associated... | 03/03/2009 |
| 7495858 | Information processing apparatus having built-in hard disk drive and head retraction processing method of built-in hard disk drive An information processing apparatus includes a hard disk drive, an acceleration sensor, and a determination section. The hard disk drive is capable of moving a head of the hard disk drive to a data-free landing zone. The acceleration sensor detects acceleration. The... | 02/24/2009 |
| 7495856 | Disk drive slider design for thermal fly-height control and burnishing-on-demand An embodiment of the invention is a slider with a lift pad and a thermal protrusion pad in which the heads are located. The lift pad is located immediately in front of the thermal protrusion pad and is designed to achieve the flying characteristics needed for normal... | 02/24/2009 |
| 7495857 | Servo writing a disk drive by writing spiral tracks using a mechanical position sensor A disk drive is disclosed including a disk, an actuator arm, a head attached to a distal end of the actuator arm, a mechanical position sensor operable to generate a position signal representing a position of the head relative to the disk, and a voice coil motor for... | 02/24/2009 |
| 7495859 | Interleaved servo pattern In general, the invention is directed to servo techniques that utilize servo patterns to facilitate head positioning relative to the data tracks. For example, the servo techniques may include a first series of servo patterns configured to allow calculation of a posi... | 02/24/2009 |
| 7492543 | Control device, control method, and storage apparatus for controlling read head and write head clearance Upon recording, a clearance control unit performs preheating by an added control value (BR) of a base heater control value B and an adjustment heater control value R and switches that to value B when it reaches a target sector to perform write. Upon reproduction, pr... | 02/17/2009 |
| 7492544 | Hard disk drive protection system and method A hard disk drive protection system comprises a sensor configured to detect an impending shock event and a hard drive protection module configured to determine whether to issue a fast park command for a hard disk drive in response to detecting the impending shock ev... | 02/17/2009 |
| 7489466 | Enabling intermittent contact recording on-demand One embodiment in accordance with the invention is a method that comprises determining if a slider of a data storage device is to perform a read or write operation with a disk of the data storage device. If the slider is to perform the read or write operation, the s... | 02/10/2009 |
| 7489465 | Apparatus, system, and method for timing based servo tape formating An apparatus, system, and method are disclosed for formatting a timing-based servo pattern on a magnetic tape. A first write head concurrently writes a base number of stripes to a plurality of first stripe patterns with a first and third element and writes the base ... | 02/10/2009 |
| 7489467 | Method for measuring track width of hard disk drive In a method of measuring track widths in a hard disk drive a plurality of estimation values are calculated based on differences in intensity between a plurality first measurement signals produced in relation to a head of the hard disk drive based on a plurality of b... | 02/10/2009 |
| 7489464 | Servo writing a disk drive using a secondary actuator to control skew angle A method of servo writing a plurality of servo sectors to a disk of a disk drive to define a plurality of data tracks is disclosed. The disk drive comprises the disk, an actuator arm, a head coupled to a distal end of the actuator arm, wherein the head comprises a r... | 02/10/2009 |
| 7486466 | Ramp-position detecting device, ramp-position detecting method, and storage device A storage medium (magnetic disk) in a storage device (magnetic disk device) includes a disk that stores therein data, a head that reads and writes data, a voice motor coil (VCM) that controls the head, and a ramp where the head is retracted. The storage device detec... | 02/03/2009 |
| 7486465 | Magnetic spacing control method for magnetic head, read/write circuit, and magnetic disk device using same In a magnetic disk device, a magnetic head protrudes when a write current is applied to a write element, and the protrusion amount is controlled using a heat generating element provided on the magnetic head. During read operations, power equal to the sum of a first ... | 02/03/2009 |
| 7486467 | Magnetic disk drive and method for registering defective sector using timing control of pattern writing Embodiments in accordance with the present invention relate to suppressing effects of the rotational jitter of a rotating medium during self-writing of patterns on the medium. In one embodiment, patterns are written on a track TE first. While a clock frequency is mo... | 02/03/2009 |
| 7486468 | Corrected read/write offset compensation A read trajectory and/or a write trajectory of a read/write head of a rotatable disk drive is adjusted using a compensation signal that compensates for a time-varying difference between the read trajectory and the write trajectory. ... | 02/03/2009 |
| 7486469 | Minimizing a mechanical mode excitation utilizing a generated seek trajectory A method of minimizing a mechanical mode excitation is disclosed. A seed position trajectory is generated utilizing a third order time polynomial, wherein the third order time polynomial is segmented for constant velocity, and deceleration. A reference position is g... | 02/03/2009 |
| 7483234 | Control device, control method, and storage apparatus for controlling read head and write head clearance by thermal protrusion Upon correction, an amplitude measurement unit repeats a process of attaining a write heat state by a write clearance control unit and writing user data to a data region of a measurement track in the state in which a head is positioned to an arbitrary measurement tr... | 01/27/2009 |
| 7483232 | Dynamic system control method Techniques are provided herein for reducing vibrations in various modes of a dynamic system. One such technique comprises incorporating vibration limiting and sensitivity constraints into a partial fraction expansion equation model of the system so as to reduce vibr... | 01/27/2009 |
| 7483233 | Method and apparatus for driving VCM unloading HDD head Provided are a voice coil motor (VCM) driving method for an HDD, related head unloading apparatus and recording media suitable for implementing the driving method. The method of driving a VCM to park a head on a ramp in the HDD includes; driving the VCM using a firs... | 01/27/2009 |
| 7480115 | Magnetic disk drive with heater to control flying height and manufacturing method thereof Embodiment of the invention improve the productivity of a magnetic disk drive that controls the flying height of a magnetic head by use of a heater. According to an embodiment, in a method for manufacturing a magnetic disk drive that writes/reads information to/from... | 01/20/2009 |
| 7477469 | Active protection system Method and apparatus for actively protecting a device from damage due to an impact or other acceleration condition. An active protection system is provided with a sensor which outputs an acceleration signal in relation to an acceleration state of the device. A circu... | 01/13/2009 |
