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7453663 |
Disk drives with servo burst patterns radially offset in different radial spokes of a disk and methods of positioning based thereon
A disk drive includes a rotatable disk, a transducer, an actuator, and a controller. The disk includes a first servo burst pattern in a first radial spoke of the disk, and a second servo burst...
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7444467 |
Storage system having a semiconductor memory device which stores data and parity data permanently
A storage system, coupled to a host computer, including at least one controller receiving data from the host computer, and a plurality of memory units connected to the controller. The controller...
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7443626 |
Patterned disk medium for vertical magnetic recording, and magnetic disk drive with the medium
A patterned disk medium includes a disk-shaped flat substrate including a first surface and a second surface located an opposite side of the first surface. First servo pattern areas including...
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7443624 |
Method for recording data freshness degrees by a tape drive
A method for recording data freshness degrees by a tape drive is disclosed. During the recording of a set of data and a data freshness degree associated with the set of data a tape recording...
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7443622 |
Magnetic recording medium, magnetic recording/reproducing apparatus, and stamper for manufacturing the magnetic recording medium
A reliable magnetic recording medium is provided which comprises a servo signal unit portions formed in a concavo-convex shape, easily produced, and resistant to tracking error. Also provided are a...
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7440210 |
Servo writing a disk drive by writing multi-bit sync marks in spiral tracks for improved servo writing
A method of writing spiral tracks on a disk of a disk drive is disclosed. The disk drive comprises control circuitry and a head disk assembly (HDA) comprising the disk, an actuator arm, a head...
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7436611 |
Method of servo writing for magnetic recording system, magnetic recording system
In a method of servo writing of a magnetic recording system and the magnetic recording system, the signal is recorded in a dummy area with a higher recording density than the burst signal. Also,...
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7436610 |
Disk drive employing different zone boundaries across disk surfaces
A disk drive is disclosed comprising a plurality of disk surfaces, including first and second disk surfaces. A first physical zone on a first disk surface has a physical zone boundary at a first...
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7433143 |
Adjusting track density by changing slope of spiral tracks used to servo write a disk drive
A method and apparatus is disclosed for adjusting the track density by changing the slope of spiral tracks used to servo write a disk drive. A target track density is established for a disk...
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7433141 |
Data randomization for rewriting in recording/reproduction apparatus
A data recording/recovery device ( 20 ) comprises a packet generator ( 34 ) for including recordable information into a packet ( 44 ), the packet initially having a nominal run length limited (RLL)...
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7428116 |
Method for a cyclic dibit response estimation in a media system using a data set separator sequence
A dibit response estimation generator receives a DSS sequence and a DSS readback sequence, which is a function of a channel processing of the DSS sequence by a read channel. The generator generates...
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7414803 |
Write protected magnetic storage media and associated methods
According to one aspect and example, a method is provided for handling write protected storage devices. The method includes generating a read signal from a portion of a magnetic storage medium and...
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7412153 |
Information recording device and method, and information recording system
In recording information, an SMPTE 339M-defined UMID buried in video and audio material signals to be recorded to a magnetic tape ( 30 ) or a UMID generated from information other than the material...
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7408731 |
Track allocation method of disk drive
Embodiments in accordance with the present invention relate to methods wherein a capacity of a disk drive is increased by partially overwriting adjacent tracks to shorten the track width and...
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7405893 |
Data storage medium with optimized servo format
A data storage medium and data storage system with improved efficiency of formatting are provided. One illustrative embodiment of the present invention pertains to a data storage medium. The data...
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7403353 |
Magnetic recording and reproducing system with recording layer having predetermined convex-concave pattern
The invention is directed to a magnetic recording/reproducing system wherein each burst pattern in discrete media is configured in a substantially trapezoidal shape (truncated quadrangular pyramid...
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7401250 |
Recording medium for storing start position information for each zone and method and apparatus of managing data using the information
A recording medium for storing start position information for each zone, a method of managing data using the information, and an apparatus for recording the information and controlling recording...
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7398006 |
Disc access processor processing a result of accessing a disc and method thereof
Prior to recording, a difference between a disc's temporal, maximum recordable length and a temporal length having been consumed by recording data is calculated. A scale is determined to allow a...
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7397630 |
Signal reproducing method and storage apparatus
A signal reproducing method reproduces servo information recorded on a recording medium by use of a head. A current calculation related to a current and an observer calculation related to a...
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7391583 |
Fault tolerant sync mark detection while servo writing a disk drive from spiral tracks
A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal...
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7388817 |
Method and apparatus for measuring head gap length of composite head
After the read head of a composite head reads sector data from a disk, a read circuit detects a sync mark in the sector data. The read circuit demodulates user data subsequent to the detected sync...
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7388725 |
Magnetic recording media, method of manufacturing the same and magnetic recording apparatus
A magnetic recording media includes a servo region including a preamble region and a burst region and having marks of a magnetic film, and a data region having discrete tracks of the magnetic film....
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7387848 |
Recording media with mechanically patterned landing zone
A method of manufacturing a magnetic recording medium, comprises steps of providing a non-magnetic substrate for a magnetic medium, the substrate including at least one major surface having a...
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7383411 |
Recording medium for storing start position information for each zone and method of managing data using the information
A recording medium for storing start position information for each zone and a method of managing data using the information. In a disc having a plurality of zones which form a group, and a spare...
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7382568 |
Circuit and method for detecting a servo wedge on spin-up of a data-storage disk
A servo circuit includes a servo channel and a processor. The servo channel recovers servo data from servo wedges that identify respective data sectors on a data-storage disk. The processor detects...
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7382560 |
Low power servo mode write driver
A circuit ( 40 ) for use in a mass data storage device ( 10 ) has first ( 44 ) second ( 46 ) current driver circuits for providing write currents to the data transducer ( 18 ). The first and second...
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7379255 |
Data structure, data storage apparatus and method
Data stored on a tape in a plurality of data recording sessions employs tape drive apparatus programmed to record the data in accordance with a format specifying a log of tape-usage information....
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7379254 |
Mixed frequency amplitude-based servo pattern
The invention is directed to a servo frame that includes servo windows written with different frequencies to provide redundant positioning information. The servo frame includes a set of first servo...
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7376861 |
Recording medium for storing start position information for each zone and method and apparatus of managing data using the information
A recording medium for storing start position information for each zone, a method of managing data using the information, and an apparatus for recording the information and controlling recording...
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7372650 |
Rotating media storage device having a calibration track with unique calibration servo synch marks
Disclosed is a rotating media storage device (RMSD) that has at least one calibration track with unique calibration servo synch marks (SSM c s). The RMSD includes a disk that comprises a plurality...
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7366887 |
System and method for loading programs from HDD independent of operating system
A method for booting into computer memory a non-operating system (O.S.) program from a hard disk drive (HDD) prior to booting into memory an O.S. from the HDD. The method includes establishing a...
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7365927 |
Eccentricity correction data recording method and recording medium having eccentricity correction data
An eccentricity correction data recording method, a disk-shaped recording medium, a head position control method and an information recording and reproducing apparatus are disclosed for effective...
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7362529 |
Disk drive with variable density data tracks
A disk drive has multiple disk surfaces and corresponding heads, each disk surface includes multiple regions, and each head is for recording on and playback of information from a corresponding disk...
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7362528 |
Magnetic recording medium
A data track area and a servo pattern area are formed on a magnetic recording medium by embedding a nonmagnetic material inside concaves in a plurality of types of convex/concave patterns formed of...
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7362527 |
Method and apparatus for retrieving data
A method of retrieving data includes caching data stored in allocation units of a memory ( 102 ), preferably a harddisk drive system, of which retrieval incurs a performance penalty. An example of...
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7359133 |
Magnetic recording medium and drive apparatus therefor
A flexible recording medium, which has a track width in the range of approximately 1-3 μm, capable of facilitating good tracking control. A magnetic pattern bearing servo signals is provided on...
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7359132 |
Equalization preamble region in digital data storage (DDS) format
A magnetic tape includes plural diagonal tracks, each storing a preamble sequence close to user data such that a transducer for reading the track reads the preamble sequence immediately before...
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7355810 |
Disk drive having a disk medium with discrete track
According to one embodiment, a disk drive using a disk medium in which servo information is embedding-recorded by a DTR method has a structure wherein a phase-difference servo burst pattern...
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7355805 |
Magnetic tape and method of manufacturing magnetic tape, servo writer, and method of and apparatus for specifying servo band
Data for specifying servo bands SB 1 to SB 5 is embedded in each servo signal S 1 to S 5 that is written on a plurality of servo bands SB 1 to SB 5 formed on a magnetic tape MT.
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7345838 |
Magnetic recording media and magnetic recording and reproducing apparatus
The present invention relates to a magnetic recording media including servo zones having magnetic or nonmagnetic patterns which are utilized as servo signals including burst marks of a burst...
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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...
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7339761 |
Method for wedge time shift calibration in a disk drive
A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in...
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7336435 |
Method and system for collecting servo field data from programmable devices in embedded disk controllers
A servo controller for an embedded disk controller comprises a read channel interface that includes a programmable control logic that receives a servo field detected signal from a module that...
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7333290 |
Magnetic disk in a disk drive and method having improved null servo burst phasing
Disclosed is a magnetic disk having servo sectors for defining data tracks. Each servo sector includes a preamble field and a null servo burst field. The preamble field is for synchronizing a...
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7330417 |
Storage device having superset format, method and system for use therewith
A storage device comprising a storage medium having a plurality of sectors and a superset format. Each sector includes a header, a data section and a trailer, the data section sized to contain a...
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7330323 |
Disk drive determining a head-switch preheat period used to format a disk
A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors. The disk drive further comprises a plurality of heads, such as a...
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7330322 |
Utilizing a combination of physical tracks and virtual tracks to store data on a data storage medium
A data storage system and a method for storing data in a data storage system are provided. The data storage system includes a data storage medium that has at least one physical track that stores at...
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7330321 |
Reference magnetic signal recording device and method of manufacturing the same
A method of simultaneously recording multiple reference magnetic signals by using a magnetic head having multiple recording portions is provided. A writing yoke formed of a ferromagnetic material...
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7324294 |
Magnetic recording disk drive with patterned media and circuit for generating timing pulses from the pattern
A magnetic recording disk drive has a patterned magnetic recording disk with data blocks of magnetizable material separated by nonmagnetic regions, a read head for reading the magnetized data...
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7319569 |
Servo writer
A servo writer is provided, which applies DC magnetization to a zone of a magnetic tape that is in advance subjected to AC erasing and writes a servo signal onto the DC magnetized zone. The servo...
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