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| Number | Title | Issue Date |
| 8390948 | Disk drive employing a preamp comprising read/write pass throughs for cascading integrated circuits A disk drive is disclosed comprising a plurality of disk surfaces and a plurality of corresponding heads. The disk drive further comprises a preamp including a first integrated circuit coupled to a first plurality of the heads. The first integrated circuit comprises... | 03/05/2013 |
| 8385015 | Method of operating pre-amplifier, pre-amplifier, and apparatuses including the same A method of operating a pre-amplifier of a hard disk drive is provided. The method includes generating a comparison signal corresponding to a result of comparing a reference signal with a difference between differential signals corresponding to write data, and contr... | 02/26/2013 |
| 8379341 | Preamp circuit including a loopback mode for data storage devices A data storage device preamplifier circuit including (i) a write amplifier having an input and an output, and (ii) a read amplifier has an input and an output. The data storage device preamplifier circuit further includes a loopback circuit configured to selectively... | 02/19/2013 |
| 8339722 | Methods of demodulating a servo positon error signal on patterned media Systems, methods and computer program products for estimating a position of a head in relation to a storage medium are described. A read channel can be used to receive a readback signal containing servo information obtained from a storage medium, and to demodulate t... | 12/25/2012 |
| 8310776 | High speed writer An apparatus comprising a control circuit, a driver circuit and a write head. The control circuit may be configured to generate a plurality of control signals in response to a data input signal. The driver circuit may be configured to generate a differential write c... | 11/13/2012 |
| 8305704 | Write data switching for magnetic disk drives One embodiment of the invention includes a system for writing data onto a magnetic disk. An output driver provides a first write current through a first output transistor in a first state and provides a second write current through a second output transistor in a se... | 11/06/2012 |
| 8295001 | Systems and methods for low latency noise cancellation Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing circuit is discussed that includes a data detector circuit, a detector mimicking circuit, and an error calculation circuit. The data detector... | 10/23/2012 |
| 8259406 | Head/disk contact determination A disk drive including a sensor element that senses contact between a head slider and a disk, a head integrated circuit (IC) comprising an amplification circuit section that amplifies a signal of the head slider, a controller IC comprising a controller that accesses... | 09/04/2012 |
| 8254048 | Dual gain control for magnetic data storage system A system according to one embodiment includes an analog input for receiving an analog signal; a variable gain amplifier coupled to the analog input; a first gain control circuit coupled to the variable gain amplifier for controlling the gain of the analog signal; an... | 08/28/2012 |
| 8223448 | Disk drive calibrating preamp for servo sectors and data sectors A disk drive is disclosed comprising a head actuated over a disk including a plurality of tracks defined by servo sectors, wherein each track comprises a plurality of data sectors. The disk drive further comprises a preamp circuit operable to amplify a read signal e... | 07/17/2012 |
| 8218257 | Disk drive with multiple level power reduction during write A disk drive data storage system comprising at least one data storage disk and a sensor assembly proximate the data storage disk. The sensor assembly further comprises circuitry for writing data to the data storage disk and circuitry for reading data from the data s... | 07/10/2012 |
| 8189281 | Magnetic recording disk drive with write driver to write head transmission line having non-uniform sections for optimal write current pulse overshoot An interconnect between the write driver and the write head in a magnetic recording disk drive enables an inherent write current overshoot. The interconnect includes an integrated lead suspension (ILS) and a short flex cable that connects the write driver circuitry ... | 05/29/2012 |
| 8169726 | Disk file preamplifier frequency-response and time delay compensation An apparatus including one or more reader circuits, one or more writer circuits, and a loopback channel. The one or more reader circuits may be configured to read data from a magnetic medium. The one or more writer circuits may be configured to write data to the mag... | 05/01/2012 |
| 8149529 | Dibit extraction for estimation of channel parameters In one embodiment, a storage-device-implemented method for estimating one or more channel parameters of a storage device including a read channel and a storage medium with a bit sequence stored on the storage medium. The method includes: (a) the storage device readi... | 04/03/2012 |
| 8107178 | Storage apparatus, method of detecting failure in head of storage apparatus, and storage medium storing failure detection program According to one embodiment, a storage apparatus includes: a read section that receives a predetermined electrical parameter to read out data from a recording medium; a characteristic detection section that detects a plurality of characteristic values corresponding ... | 01/31/2012 |
| 8077415 | Preamp circuit including a loopback mode for data storage devices A data storage device preamplifier circuit including (i) a write amplifier having an input and an output, and (ii) a read amplifier has an input and an output. The data storage device preamplifier circuit further includes a loopback circuit configured to selectively... | 12/13/2011 |
| 8040627 | Methods and apparatus for generating a hard drive write signal Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal bas... | 10/18/2011 |
| 8027113 | Magnetic read/write device preventing malfunction due to reversal in polarity Embodiments of the invention provide a magnetic read/write device capable of reading/writing data even when a reversal of the output polarity of the readback signal occurs. In one embodiment, a magnetic read/write device is provided which constantly checks the outpu... | 09/27/2011 |
| 7986479 | Circuit for correcting signal distortions A corrector circuit for correcting second harmonic distortions is provided. The corrector circuit includes a transconductance circuit having an input transconductance with a transresistance load for receiving a distorted voltage signal having a second harmonic compo... | 07/26/2011 |
| 7982992 | Dual gain control for magnetic data storage system A system according to one embodiment includes an analog input for receiving an analog signal; a variable gain amplifier coupled to the analog input; a first gain control circuit coupled to the variable gain amplifier for controlling the gain of the analog signal; an... | 07/19/2011 |
| 7982991 | Method and apparatus for determining set value of write current of magnetic head Embodiments of the present invention help to efficiently determine the appropriate setting of the write current of a magnetic head relative to temperature. According to one embodiment, a test computer determines the set value of a write current as a function of temp... | 07/19/2011 |
| 7933086 | Power supply voltage supply circuit and disk apparatus Aspects of the present embodiment are related to a power supply voltage supply circuit and the disk apparatus that are capable of reducing power consumption in data writing and reading. The power supply voltage supply circuit includes a data processing unit writing ... | 04/26/2011 |
| 7880989 | Write driver circuit for magnetic data storage systems A write driver circuit includes a first write driver that communicates with a first node of a write head. A first feedback path communicates with a control input and an output of the first write driver. The first feedback path includes a first resistance connected b... | 02/01/2011 |
| 7864467 | Gain control for data-dependent detection in magnetic storage read channels Method, apparatus and computer program product adjust gain in a read channel of a magnetic media data storage device. A digital signal sample having a data-dependent noise component is received. A gain value, stored in a location in a gain table, is selected in a da... | 01/04/2011 |
| 7859781 | Head IC that adjusts the amplitude level of a read signal of a head A head IC, which adjusts an amplitude level of a read signal of a head, for outputting to a read channel having an AGC amplifier, includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. Since the AGC amplifier is disposed in... | 12/28/2010 |
| 7852584 | Head IC, read circuit, and media storage device A head IC adjusts an amplitude level of head read signals with regard to scattering in head output characteristics, so as to conform to the input dynamic range of the read channel AGC. An AGC amplifier is provided in a head IC connected to a read channel, and the fe... | 12/14/2010 |
| 7852585 | Preamp circuit including a loopback mode for data storage devices A method for testing operation of a preamplifier circuit includes generating a first symbol, converting the first symbol into a write signal, transmitting the write signal to a write signal input of the preamplifier circuit, and looping the write signal back to a re... | 12/14/2010 |
| 7848038 | Boosted write driver for transmission line with reduction in parasitic effect of protection devices A driver for driving a load over a transmission line, such as driving the magnetic head of a hard disk drive. The driver includes a signal switch for switching the signal to the load during a signal period, and a boost switch for boosting the signal during a boost p... | 12/07/2010 |
| 7843659 | Head IC, read circuit, media storage device and amplifier gain adjustment method for head IC A head IC adjusts an amplitude level of a read signal of a head and outputs the adjusted signal to a read channel having an AGC amplifier. A head IC includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. The AGC amplifier i... | 11/30/2010 |
| 7839589 | Write current waveform asymmetry compensation A write current circuit (300, 400) adapted to drive a thin film write head (202) of a mass media information storage device. The write current circuit (300, 400) further includes programming circuitry (311, 411) driven such that parameter... | 11/23/2010 |
| 7835097 | Preamplifier arranged in proximity of disk drive head A magnetic storage circuit comprises a preamplifier writer that selectively generates a write current that has a boost stage and a settling stage. An impedance changing circuit communicates with the preamplifier writer and provides a lower resistance value during th... | 11/16/2010 |
| 7835098 | Automatic gain control for magnetic disk-drive preamplifier One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system comprises a read amplifier configured to generate a read signal corresponding to data that is read from a magnetic disk via a magneto-resistive (MR) read head. The s... | 11/16/2010 |
| 7830631 | Controlling an overshoot amplitude level based on a recording data pattern in a magnetic disk drive Embodiments of the present invention reduce lowering of a recording current and a recording magnetic field that might occur upon execution of write pre-compensation for compensating the NLTS according to a perpendicular magnetic recording method. According to one em... | 11/09/2010 |
| 7830630 | Circuit and method for detecting the phase of a servo signal A detector recovers servo data from a servo signal generated by a read-write head, and determines the head-connection polarity from the recovered servo data. Such a detector allows a servo circuit to compensate for a reversed-connected read-write head, and thus allo... | 11/09/2010 |
| 7821730 | Systems and methods for compensating baseline wandering in perpendicular magnetic recording Various embodiments of the present invention provide systems and methods for reducing low frequency loss in a magnetic storage device. For example, a data processing circuit is disclosed that includes a digital filter that receives a series of digital samples and pr... | 10/26/2010 |
| 7813068 | Degauss control for magnetic disk-drive preamplifier One embodiment of the invention includes a preamplifier system for a magnetic disk-drive. The system includes a current distributor configured to generate a reference current and to decay the reference current from a first magnitude to a second magnitude during a de... | 10/12/2010 |
| 7764453 | Method for interfacing non-volatile medium control system components In a method for causing data to be written to a non-volatile medium, an indication of a size of a sector or a sector fragment may be transmitted to a channel device, and an indication of a size of a codeword to be written in the sector may be transmitted to the chan... | 07/27/2010 |
| 7738202 | Wide-biphase-detector quality monitor for sensing of pin layer reversal An apparatus and method are disclosed for decoding servo data recorded on a magnetic disk drive and detecting pinned layer reversals and signal errors, for example, errors due to noise. The servo data is encoded using wide-bi-phase encoding. This encoding is detecte... | 06/15/2010 |
| 7729072 | Open write-head-cable test method and detector A storage drive implements a method for operating the storage drive between a plurality of operational modes. For a test mode of the storage drive, a write current driver circuit and a test current sensor are electrically connected to the write head, wherein the tes... | 06/01/2010 |
| 7715136 | Hard disk drive preamplifier with reduced pin count A disk drive controller including a preamplifier and a controller is disclosed, in which communications between the controller and the preamplifier are carried out over at least some shared terminals and conductors. A first pair of differential lines is provided to ... | 05/11/2010 |
