Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8093888 | Head assembly drive mechanism, head holder, magnetic head tester and magnetic disk tester A head holder includes a first and second blocks connected each other with a predetermined gap between the blocks by a flexible coupling portion. The second block supports the first block swingably by increasing a width of either one of spaces of the predetermined g... | 01/10/2012 |
| 7888930 | Method for testing mold structure and magnetic recording medium The present invention provides a method for testing a disc shaped mold structure having a convexo-concave pattern formed on a surface thereof based on a desired design pattern, including at least: transferring a magnetic signal corresponding to a convexo-concave pat... | 02/15/2011 |
| 7880463 | Automated disk clamping method for spinstand for testing magnetic heads and disks A mechanism for placing and removing a vacuum clamping device for a magnetic disk on a spinstand, comprised of automated vertical and horizontal movement arranged such that a vacuum disk chuck, comprised of a base (9) and cap (6), can be used without o... | 02/01/2011 |
| 7405907 | Adjacent magnetoresistive read head and method for obtaining position error signal A read head for reading magnetically stored data in adjacent tracks of a medium has at least two elongate bodies, each having at least one magnetoresistive part. The magnetoresistive parts have sensor portions defined along a length of the elongate bodies, by electr... | 07/29/2008 |
| 7363697 | Method for manufacturing a group of head gimbal assemblies A system and method for the production level screening of low flying magnetic heads in the manufacture of disk drive head disk assemblies (HDAs) is disclosed. A test disk is provided and has a plurality of bumps extending from at least one surface thereof. The test ... | 04/29/2008 |
| 7355393 | Magnetic head slider testing apparatus and magnetic head slider testing method In the present invention, a coil generating DC magnetic field applied to a magnetic head is divided into two in that a first coil and a second coil, which are provided on a frame shape core. An distance of an air gap is shortened, a slider head is held on a table ha... | 04/08/2008 |
| 7354664 | Magnetically soft, high saturation magnetization laminate of iron-cobalt-nitrogen and iron-nickel for perpendicular media underlayers A magnetic disk has a soft magnetic underlayer comprising a first layer containing NiFe having a concentration of iron that is at least thirty percent and not more than seventy percent; a second layer that adjoins the first layer and contains FeCoN having a concentr... | 04/08/2008 |
| 7355399 | Non-contact sensor system A non-contact sensor system according to one embodiment includes a substrate having a substantially planar surface with at least one sensor element mounted to the substrate, the at least one sensor element being directed by a guiding element towards at least one dat... | 04/08/2008 |
| 7352175 | Probe card method A probe card method, wherein a base supports a probe pin and an electromagnet. When the probe pin contacts a magnetic-sensor terminal on a chip on a wafer, magnetic force is applied to a magnetic-field sensing section in the chip. ... | 04/01/2008 |
| 7342741 | Disk drive with variable track density A method of manufacturing a disk drive is disclosed in which servo information is written in tracks on a disk surface, the track width performance of the associated read/write transducer is measured, the track width performance is analyzed and a data track pitch is ... | 03/11/2008 |
| 7336434 | Predictive failure analysis of thermal flying height control system and method A method for predicting the failure of a data storage device having a slider heater is disclosed. For slider heaters exhibiting a decreasing resistance aging characteristic, a failure warning is produced when heater resistance suddenly increases 2 to 5%, or dR/dt ch... | 02/26/2008 |
| 7328118 | Method of determining the mass unbalance of an actuator The present invention is a method of determining mass unbalance of an actuator mechanism in a system. The method includes calculating a center of gravity in first x and y components with respect to a first coordinate system of the actuator mechanism. The method also... | 02/05/2008 |
| 7314404 | Burnishing head A burnishing head comprises at least two rails, each rail having an inner wall and an outer wall. The outer walls are at an angle relative to one another and relative to a central axis of the burnishing head. This angle permits the burnishing head to exhibit improve... | 01/01/2008 |
| 7307418 | Systems for recording position information in a magnetic layer on a piston rod Described are system for recording piston rod position information in a magnetic layer on the piston rod. A piston rod has a magnetically hard layer formed thereon to provide a recording medium. A magnetic pattern is recorded in the magnetically hard layer. A magnet... | 12/11/2007 |
| 7295002 | Vacuum chuck spinstand for testing magnetic heads and disks A spinstand having a vacuum chuck clamping mechanism for securing magnetic discs includes a cap (9) and a base (10). A disk-to-be-clamped is held between the cap (9) and the base (10). Vacuum, applied through a port (4) in a mounti... | 11/13/2007 |
| 7288935 | System, method, and apparatus for dynamic electrical testing of workpieces by multiplexing test sites with shared electronics A dynamic electrical tester (DET) for testing head gimbal assemblies (HGA) is disclosed. The DET simulates disk drive operation while significantly reducing tester capital investment. Multiple HGAs are tested simultaneously using modular spin stands with shared elec... | 10/30/2007 |
| 7289285 | Information storage systems An information storage apparatus includes a storage media including a plurality of information tracks. Each storage medium has a head assembly having a substantially planar surface and a plurality of read/write heads positioned in registry with the information track... | 10/30/2007 |
| 7280366 | System and method for housing power supplies in an electronic device A housing for an electronic device has a first volume bounded by a first face and a second volume bounded by a second face. The second face is indented from the first face. A plurality of electronic components are housed in the first volume, and one or more power su... | 10/09/2007 |
| 7278902 | Enabling location specific burnishing of a disk Various embodiments of the present invention pertain to enabling location specific burnishing of a disk. According to one embodiment, the smoothness of a disk is evaluated by gliding over a disk to determine if there is an asperity on the disk. If there is an asperi... | 10/09/2007 |
| 7276900 | Magnetic characteristic inspecting apparatus and inspecting method using it A magnetic characteristic inspecting apparatus including a plurality of disk rotating devices or a plurality of magnetic heads include a unit for switching output signals of write signal production units or allocating the output signals to the magnetic heads, a unit... | 10/02/2007 |
| 7277246 | Methods and systems for providing predictive maintenance, preventative maintenance, and/or failure isolation in a tape storage subsystem A system and method of operating a storage system is provided. The storage system includes a tape cartridge having a magnetic tape medium and a tape drive for reading and writing data to the magnetic tape medium of the tape cartridge. Performance data associated wit... | 10/02/2007 |
| 7271967 | System and method for determining whether defect in perpendicular recording disk drive is from thermal asperity or defect in magnetically soft underlayer A method for determining whether a spike in a read back signal from a read head positioned over a perpendicular recording disk having a magnetically soft underlayer (SUL) is caused by a defect in the SUL or by a thermal asperity (TA). A first read back signal with t... | 09/18/2007 |
| 7267274 | Magnetic ink validation for coupon and gaming industries A device and method for validating a ticket having magnetic ink printed on at least one side of a ticket. The ink is magnetized to create a magnetic signal in the magnetic ink and thereafter a media reader sensor spaced from the ticket is used to verify the existenc... | 09/11/2007 |
| 7266873 | Throw-away burnishing tool for outside diameter and for inside diameter A throw-away burnishing tool for an outside diameter includes: a tool holder having a rectilinear I-shaped portion and a protrusion portion; a hard material tip detachably attached to a tip holder; a holder pin connected to the tip holder and accommodated in the pro... | 09/11/2007 |
| 7265922 | Asperity data storage system, method and medium An asperity data storage system wherein asperities are used to represent stored data. The asperity data storage system includes an asperity transducer that thermally interacts with a data storage medium adapted to store an information-encoded pattern of asperities t... | 09/04/2007 |
| 7259931 | Slider design for high fly write immunity An embodiment of a slider in accordance with the present invention for use in a hard disk drive having a rotatable disk can include a plurality of rails arranged across a surface of the slider such that an air bearing is formed when the slider is positioned over the... | 08/21/2007 |
| 7257823 | Method and apparatus for preventing damage due to media faults in discs spinning at high speeds A system that prevents fragments of a disc from escaping from a drive. According to one embodiment of the present invention, the system comprises a drive and a fragment barricade affixed within the drive. The fragment barricade is positioned within the drive so as t... | 08/14/2007 |
| 7253889 | Shaft cone metrology system and method Aspects include metrology methods and systems for determining characteristics of conical shaft portions, such as angle of taper. In an example, a metrology system includes a fixture for supporting a workpiece. The fixture provides for translation in a longitudinal d... | 08/07/2007 |
| 7249406 | Method to detect magnetic pole defects in perpendicular recording heads at wafer level The perpendicular magnetic head fabrication and testing method includes the additional fabrication of magnetic pole testing structures in the kerf area of the wafer substrate. Particularly, magnetic interconnect pieces are fabricated in the kerf area to magnetically... | 07/31/2007 |
| 7248039 | Disk pack swap process for evaluating magnetic recording performance A method for testing electromagnetic characteristics of magnetic media while maintaining consistent performance of a read/write head and recording channel is disclosed. The disclosed method is performed such that reduced statistical sampling is achieved. The method ... | 07/24/2007 |
| 7248040 | Disk testing apparatus, disk testing method, computer-readable recording medium that stores a disk testing program, and disk apparatus including a disk to be tested A disk testing apparatus that sets a predetermined condition of a recording density for a disk apparatus, and conducts a test relating to at least readout of data stored in the disk apparatus includes a condition relaxing unit that relaxes, when a result of the test... | 07/24/2007 |
| 7245638 | Methods and systems for DSP-based receivers Digital signal processing based methods and systems for receiving data signals include parallel receivers, multi-channel receivers, timing recovery schemes, and, without limitation, equalization schemes. The present invention is implemented as a multi-path parallel ... | 07/17/2007 |
| 7239472 | Method and apparatus for writing data in a disk drive According to one embodiment, there is to provide a data write method which is applied to a disk drive, for recording data on a disk medium by a head mounted on a rotary type actuator. The method carries out a track pitch conversion processing so that a track pitch o... | 07/03/2007 |
| 7233142 | Planer reader of non-erasable magnetic media and local permeability A planer reader and method of probing the magnetic permeability of a material using a magnetic flux circuit comprises a substrate; a near-circular soft magnetic layer adjacent to the substrate; a gap configured in the soft magnetic layer, wherein the gap creates an ... | 06/19/2007 |
| 7221985 | On-screen calibration system and operating method thereof An on-screen calibration system for disc drives and the operating method thereof. The calibration system includes an autocollimator detecting the inclined angle of the stage of a disc drive. A control module is connected to the on-screen display module and a bar cod... | 05/22/2007 |
| 7212000 | Detection of a defective disk of a hard disk drive A method and apparatus for detecting a defective disk for a hard disk drive. The method includes placing a disk into a tester so that a first side of the disk is adjacent to a first head of the tester and a second side of the disk is adjacent to a second head. First... | 05/01/2007 |
| 7210451 | Throttle control devices A throttle control device includes a motor coupled to the throttle shaft, so that the throttle valve rotates to open and close an intake air channel as the motor is driven. A detection device serves to detect the degree of opening of the throttle valve and includes ... | 05/01/2007 |
| 7208948 | Non-contact, high resolution magnetic sensor system A non-contact magnetic sensor system according to one embodiment includes a substrate and a magnetic medium spaced from the substrate and having a data track thereon. A sensor element is mounted to the substrate. A guiding element biases the substrate towards the ma... | 04/24/2007 |
| 7199960 | Disk drive with AC exciter for head/disk interface A disk drive includes a disk for storing information, a head with a transducer that writes data to and reads data from the disk, and an AC power source. The head is suspended adjacent to the disk and a flying height gap exists at the head/disk interface. The AC powe... | 04/03/2007 |
| 7200170 | High speed I-O loopback testing with low speed DC test capability A loopback circuit for testing low and high frequency operation of integrated circuit transmitter and receiver components. First and second resistors forming a first branch of the circuit are series-connected between first and second circuit ports. Third and fourth ... | 04/03/2007 |
