Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 7355808 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 04/08/2008 |
| 7253987 | Disturbance signal reduction in servo systems A servo system includes a first member and a second member that is positionable relative to the first member. A position error signal causes the second member to be positioned at a desired location relative to the first member. The position error signal includes a p... | 08/07/2007 |
| 7230789 | Method and apparatus for performing a self-servo write operation in a disk drive using spiral servo information The present invention is directed to a method and apparatus for performing a self-servo write operation in a disk drive. In one embodiment, the disk drive includes a disk surface having a read head and a write head associated therewith. Spiral servo information is w... | 06/12/2007 |
| 7161759 | Self servo writing using servo burst edge errors for compound error correction The present invention provides self-servo writing by which self-propagated servo pattern track shape errors are reduced or eliminated. The method includes providing first servo bursts on a first track, measuring edge errors of the first servo bursts, and self-servo ... | 01/09/2007 |
| 7158325 | Disk drive head touchdown detection with improved discrimination A disk drive detects head touchdown based on a magnitude of a position error signal at a discrete frequency. The discrete frequency is one-half the disk rotation frequency or an integral multiple of the disk rotation frequency. The head is heated by turning on a hea... | 01/02/2007 |
| 7154689 | Apparatus for writing servo bursts on a disk with servo track pitch based on read element width and methods of manufacturing same Methods for making a disk drive, apparatus for writing servo bursts on a disk, and disk drive apparatus are provided. The disk drive includes a disk and transducer adjacent to the disk. The transducer includes a read element and a write element. A width of the read ... | 12/26/2006 |
| 7145745 | Multi-stage actuator disk drives, methods, and computer program products that compensate for repeatable runout based on estimated secondary actuator position Methods of compensating for repeatable runout in a disk drive are provided. The disk drive includes a data storage disk, a transducer adjacent to the disk, a primary actuator for positioning the transducer over a first range of movement, and a secondary actuator for... | 12/05/2006 |
| 7106542 | Method and apparatus for determining embedded runout correction values when self-servo writing or partial self-servo writing a disk drive A method and apparatus for determining embedded runout correction values when self-servo writing or partial self-servo writing is disclosed. In one embodiment, a disk surface, which has servo information written thereon, is provided. The servo information is grouped... | 09/12/2006 |
| 7054096 | Method and apparatus for determining embedded runout correction values A method and apparatus for compensating for non-linearities due to pivot bearing friction when determining embedded runout correction values during partial self-servo write of a disk drive is disclosed. In one embodiment, the disk drive includes a disk surface havin... | 05/30/2006 |
| 7050260 | Method and apparatus for partial self-servo writing using servo wedge propagation A method and apparatus for partial self-servo writing a disk surface in a disk drive using servo wedge propagation is provided. In one embodiment, servo information is written by a servo track writer near an outer diameter of the disk surface. The servo information ... | 05/23/2006 |
| 7050259 | High precision servo track writing with position error signal feedback A servo writer system for a disk drive uses the reader element of a magnetic transducer head in the disk drive to read head position information during servo writing of the disk drive. A positioning system in the servo writer uses both the head position information ... | 05/23/2006 |
| 7035041 | Displacement resetting systems and methods for the second stage of a hard disk drive dual-stage actuator A control system and method for a disk drive comprising first and second actuator arms. The control system comprises first and second stages and a reset system. The first stage displaces the first arm. The second stage displaces the second arm relative to the first ... | 04/25/2006 |
| 6977790 | Design scheme to increase the gain of strain based sensors in hard disk drive actuators An actuator arm assembly has an actuator arm and an actuator for moving the actuator arm whereby the arm assembly experiences vibrations. The actuator has a body with a recess formed therein, and a strain sensor is fitted essentially inside the recess such that the ... | 12/20/2005 |
| 6975482 | Settle control systems and methods for the second stage of a dual stage actuator An actuator control system and method for a hard disk drive comprising first and second actuators that support a head relative to a disk is disclosed. The actuator control system comprises a first stage, a second stage, a memory device, and a maximum stroke calculat... | 12/13/2005 |
| 6975477 | Micro actuator DC gain calibration scheme for HDD dual-stage actuator systems A servo system for displacing a head relative to a disk of a hard disk drive. The servo system comprises a dual-stage actuator, a calibration signal generator, and a calibration factor generator. The calibration signal generator generates a calibration signal having... | 12/13/2005 |
| 6938326 | Method of making at least one suspension load beam for an actuator assembly of a disk drive A suspension load beam for an actuator assembly of a disk drive includes a bend radius portion with a spring rate that is less than 18 Newtons per meter, a first bending mode that is greater than 3,500 Hertz, and a first torsion mode that is greater than 5,300 Hertz... | 09/06/2005 |
| 6867949 | Vibration-damped push-pin assembly for disk drive servo writing The present invention is directed to a push-pin assembly for use with a positioning arm of a disk drive servo writer. The push-pin assembly promotes vibrational damping between the push-pin assembly and the actuator arm. Push-pin assemblies of the invention generall... | 03/15/2005 |
| 6798610 | Disk drive with self servo writing capability The present invention is directed to utilizing the capabilities of multi-stage actuators in disk drives to do self servo writing on the disk surfaces, thereby avoiding the use of a servo track writer. In one embodiment, a crash stop that limits the range of motion o... | 09/28/2004 |
| 6744577 | Piezoelectric actuator and shock sensor A dual purpose piezoelectric element utilized in a disk drive for fine positioning of the head assembly relative to the surface of a disk and for sensing shocks and other vibrations. When a shock is sensed by the piezoelectric element that exceeds a predetermined th... | 06/01/2004 |
| 6721124 | Method and apparatus for providing an intelligent settle scheme for a hard disk drive with dual stage actuators A method and apparatus for controlling the position of a computer hard disk drive transducer head are provided. According to the invention, an initial value compensation scheme is applied to a signal derived from available states of the transducer head when the cont... | 04/13/2004 |
| 6687091 | Suspension load beam for disk drive actuator with notch for reducing spring rate A suspension load beam for an actuator assembly of a disk drive includes a bend radius portion with a spring rate that is less than 18 Newtons per meter, a first bending mode that is greater than 3,500 Hertz, and a first torsion mode that is greater than ... | 02/03/2004 |
| 6532135 | Suspension load beam for disk drive actuator A suspension load beam for an actuator assembly of a disk drive includes a bend radius portion with a spring rate that is less than 18 Newtons per meter, a first bending mode that is greater than 3,500 Hertz, and a first torsion mode that is greater than ... | 03/11/2003 |
| 6493176 | Disk drive with variable TPI servo tracks The present invention is directed to utilizing the capabilities of multi-stage actuators in disk drives to write servo tracks that have a variable number of tracks-per-inch (TPI) from head to head, thereby improving both the performance of the drive and m... | 12/10/2002 |
| 6445545 | Apparatus for minimizing head off-track due to disk flutter A slider support structure is disclosed for minimizing off-rack due to disk flutter. In one embodiment, the slider support structure includes a gimbal assembly (306). The assembly (306) includes an outer ring (500) and an inner ring (502). The outer ring ... | 09/03/2002 |
| 6437937 | Disk drive with high speed read/write capability The present invention is directed to a disk drive that utilizes a multi-stage actuator associated with two or more heads that are each associated with a separate disk surface to realize high speed data transfers. In one embodiment, the multi-stage actuato... | 08/20/2002 |
| 6266205 | Parallel servo with ultra high bandwidth off-track detection A magnetic storage system having one or more rotating disks is disclosed. In a preferred embodiment, each rotating disk has two magnetic surfaces which each contain a number of tracks. Each track has one or more data regions and one or more embedded servo... | 07/24/2001 |
| 6188484 | Method and apparatus for measuring angular displacement of an actuator arm relative to a reference position An apparatus for directly measuring an angular displacement of an actuator arm relative to a reference position is disclosed, wherein the actuator arm is rotatable about a fixed axis. The apparatus includes a reflection-type diffraction grating, a light s... | 02/13/2001 |
