Matches 1 - 50 out of 62 1 2 >


Match Document Document Title
US20100246056 DETERMINATION OF WEDGE OFFSET CORRECTION VALUES FOR A DISK DRIVE  
In a disk drive, a wedge-based scheme is used to determine wedge offset correction values for a track of the disk drive. Correction values for the offset of each servo wedge are calculated...
US20120154949 BIPOLAR POSITION ERROR BURSTS WITH UNIPOLAR SERVO FIELDS  
A storage medium has a first servo field having magnetic lands separated by nonmagnetic areas, the magnetic lands of the first servo field having a unipolar pattern. The medium further includes a...
US20130010385 SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNED MEDIA AND USE OF A SINGLE MASTER TEMPLATE  
Embodiments described herein provide for robust servo patterns that comply with planarization constraints and also allow use of a single master template for manufacture of both the front and back...
US20130010384 SERVO PATTERN COMPATIBLE WITH PLANARIZATION CONSTRAINTS OF PATTERNED MEDIA AND USE OF A SINGLE MASTER TEMPLATE  
Embodiments described herein provide for robust servo patterns that comply with planarization constraints and also allow use of a single master template for manufacture of both the front and back...
US20100067142 Phase Servo Patterns for Bit Patterned Media  
A recordable medium according to some embodiments includes a servo control field having a bit patterned media (BPM) pattern. The pattern includes a plurality of isolated magnetic islands or dots...
US20110188149 SERVO PATTERNING COMPATIBLE WITH PLANARIZATION OF PATTERNED MAGNETIC DISKS  
Embodiments herein illustrate patterned servo data that allows the patterned disk to be planarized with a relatively simple planarization process. A magnetic disk, in this regard, includes a data...
US20090073602 SERVO INFORMATION WRITING METHOD, MAGNETIC HEAD TESTER AND MAGNETIC DISK TESTER USING THE SERVO INFORMATION WRITING METHOD  
A mark information is recorded in an area which is on a circumference of a magnetic disk corresponding to a last track in which a servo information write is ended or a track, which is one or two...
US20090168230 Mixed format disk drive  
A magnetic disk for a hard disk drive comprising a plurality of physical sector sizes is disclosed. The magnetic disk includes a first sector size area physically formatted according to a first...
US20100073810 Encoding Scheme for Bit Patterned Media  
A bit patterned media (BPM) encoded recordable medium includes a servo control field including servo bits. Each servo bit is represented by a servo bit pattern of dots and gaps on the recordable...
US20090237832 ERROR CORRECTION CODING OF LONGITUDINAL POSITION INFORMATION  
A sequential data storage medium, comprising a sequence of plurality of servo patterns that provide lateral position information and longitudinal position information, wherein each of the...
US20080239557 Multi-directional self servo-writing for a disk drive  
A method of self servo-writing servo information to a plurality of disk surfaces in a disk drive that includes writing servo information to a plurality of disk surfaces in a first direction,...
US20070253095 Pattern write method and demagnetization state determination method  
Embodiments in accordance with the present invention control pitch variations that are not observed in self servo write (SSW). According to one embodiment of the present invention, an outer radius...
US20090290254 CONTROLLING DEVICE, MAGNETIC STORAGE MEDIUM, STORAGE DEVICE, AND METHOD FOR DETERMINING OFFSET AMOUNT  
A magnetic storage medium has tracks and guard bands magnetically separating adjacent tracks. The tracks and the guard bands are alternately and concentrically disposed. The tracks includes a...
US20090195917 HARD DISC APPARATUS AND HEAD ALIGNMENT METHOD  
According to one embodiment, a hard disc apparatus comprises a disc, wherein areas between neighboring servo areas are allocated to data areas including data sectors, a head module, and a storage...
US20060132951 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...
US20050141134 System and method for disk formatting  
The gap of a write head on an arm of a rotating media storage device is positioned at an angle off perpendicular from an arm chord, which is a line defined from the center of the gap to the center...
US20060280974 Magnetic disk medium, reticle and magnetic recording and reproducing apparatus  
A magnetic disc medium according to an aspect of the present invention includes: a preamble part in a servo area of each of sectors obtained by dividing a surface of the medium in a circumference...
US20070127152 Disk apparatus and method of data read and write  
A disk apparatus and a method of data read/write are provided in which even when off-track error occurs at the end sector, the occurrence of the off-track error is detected reliably. Data is read...
US20080259488 Method and apparatus improving prevention of off-track writing in a hard disk drive  
Embodiments of the invention include: a hard disk drive using a read track to position for writing to a write track and generating a position error signal (PES) based upon all four servo offset...
US20080239556 Linearizing position error signal using spiral servo information  
A method for determining a position error signal in a disk drive includes writing a servo signal that has a variable offset from a track center for a plurality of concentric tracks in a servo...
US20080259489 Apparatus and Method for Generating a Servo Pattern  
A method of writing a servo pattern to a disk, wherein a servo pattern is generated in a processor. The generated servo pattern is then written to a disk. The servo pattern for a servo sector is...
US20080239555 Multi-quadrant wedge offset reduction field values for disk drive servo  
A method for servo correction includes determining a first wedge offset reduction field value for a read element from information in a servo burst area of a wedge on a disk, storing the first...
US20080316639 Large data block written on overlapping tracks in a hard disk drive  
A hard disk drive with a disk that includes a first group of tracks and a second group of tracks. The second group of tracks are used to write large blocks of data. For example, data in the second...
US20060215310 Systems and methods for encoding identifying information on a surface of a rotatable medium  
Systems and methods in accordance with embodiments of the present invention can be applied to encode non-servo information on a rotatable medium connected with a data storage device. For example,...
US20090040652 MAGNETIC RECORDING DISK AND DISK DRIVE WITH PATTERNED PHASE-TYPE SERVO FIELDS FOR READ/WRITE HEAD POSITIONING  
A magnetic recording disk drive uses a disk having pre-patterned servo sectors extending generally radially across the data tracks. The servo sectors include at least two position error signal...
US20070159711 Method and apparatus for increasing storage capacity of a hard disk drive  
A method and apparatus for improving the capacity of a hard disk drive is provided. In one embodiment, a portion of timing information is written to a first disk prior to coupling the first disk...
US20090122441 Bit Patterned Magnetic Media Data Format  
In an implementation, a media drive comprises bit patterned magnetic media and one or more modules. The one or more modules are to cause data to be written on the bit patterned magnetic media in a...
US20080062553 Disk recording medium and information recording apparatus  
In the case of a magnetic head tracing a record track from the left to right, a positional demodulation signal obtained by passing a first servo sector existing in the record track is minutely...
US20060221486 Reading tracks from a media during back-EMF velocity control  
A method in accordance with the present invention includes determining a set of tracks scanning during testing of the disk surface for defects. An average load position or a load position a slider...
US20120087037 Patterned media with structured PES servo segments encoding local track position  
Patterned magnetic media are described in which the servo sectors include at least two PES offset segments that can be used for the position error signal (PES) and identification of local track...
US20100079904 STORAGE CONTROL METHOD, STORAGE CONTROL UNIT AND STORAGE APPARATUS  
A control method includes determining whether a size of write data specified by a command supplied from a host is smaller than a size of a physical sector of a recording medium, lowering priority...
US20050128634 Systems and methods for improved worf calculation  
Wedge Offset Reduction Field (WORF) data can be used to reduce the effective written-in runout of a servo pattern. In order to prevent the WORF data from being applied to an improper portion of...
US20100073811 MAGNETIC DISK AND MAGNETIC DISK DEVICE  
A magnetic disk includes: a data recording region having first magnetic parts; the first magnetic parts being arranged in a circumferential direction in the nonmagnetic region and form tracks, and...
US20060193072 Information recording apparatus and method, magnetic disk producing apparatus and method, and magnetic disk  
Address information/ID information is recorded to a magnetic disk whose recording tracks are formed of lands. There is provided an information recording apparatus for recording address...
US20070183081 Data storage device and defective area management method therefor  
Embodiments in accordance with the present invention increase the possibility that a servo track in which servo data is defective may be detected, greatly decreasing the possibility that a write...
US20080151414 METHOD AND APPARATUS FOR POSITIONING HEAD USING SPIRAL SERVO PATTERN IN A DISK DRIVE  
According to one embodiment, there is to provide a disk drive which calculates an error in the position of a head on the basis of concentric servo patterns. The disk drive has a disk medium on...
US20110149433 Information storage device with multiple-use fields in servo pattern  
An embodiment of the present invention implements some or all major servo subfunctions for a storage device in integrated servo fields comprising sequences of encoded bits having selected...
US20080180825 Detection of servo data for a servo system  
A servo system for detecting and demodulating servo data is disclosed. In illustrated aspects, a demodulation circuit or portion includes a correlator component configured to output a correlation...
US20090195918 METHOD AND APPARATUS FOR REPRODUCING INFORMATION ON BIT-PATTERNED RECORDING MEDIUM  
The information reproducing method manages an average magnetization state of each sector on a bit-patterned recording medium as sector management information and sets an information reproduction...
US20080239558 METHODS AND APPARATUS FOR DURATION CONTROL OF HARD DRIVE WRITE SIGNALS  
Methods and apparatus for controlling the duration of a pulse in a hard drive write system are disclosed. A disclosed method comprises generating a current pulse, reducing the current of the pulse...
US20090168231 METHOD AND APPARATUS FOR REPRODUCING SERVO DATA FROM A DISCRETE TRACK MEDIA IN A DISK DRIVE  
According to one embodiment, disclosed herein is a disk drive that has a disk of discrete-track media (DTM) type. The DTM disk has servo regions. Each servo region has dividing grooves and...
US20050141129 Systems and methods for rewriting user data in rotatable storage media  
Systems and methods in accordance with embodiments can be used to re-write data to a rotatable storage medium. When a position of a write element is not within a threshold during a data write...
US20100290153 SERVO PROCESSORS THAT ALTERNATELY CONTROL HEAD POSITIONING RELATIVE TO SEQUENTIAL SERVO PATTERNS  
The operational bandwidth of a servo control circuit can be increased using a plurality of servo processors that handoff between them the responsibility for controlling head positioning in...
US20080158718 MAGNETIC RECORDING MEDIUM, RECORDING AND REPRODUCING DEVICE, MAGNETIC RECORDING MEDIUM-MAGNETIZING METHOD, AND MAGNETIC RECORDING MEDIUM-MAGNETIZING DEVICE  
A magnetic recording medium enhances the quality of a reproducing signal. The magnetic recording medium has a servo pattern formed in a servo pattern area on at least one surface of a disk-shaped...
US20050052777 Method and apparatus for positioning head using servo burst signals in a disk drive  
There is disclosed a disk drive using a disk in which servo data is recorded, wherein a CPU executes control to position a head by use of a servo burst calculation result and a difference value...
US20110149432 Information storage device with multiple-use fields in servo pattern  
An embodiment of the present invention implements some or all major servo subfunctions for a storage device in integrated servo fields comprising sequences of encoded bits having selected...
US20070247741 Method of servo pattern writing on recording surface and data storage device  
In an embodiment of the present invention, with Self Servo Write (SSW), a head slider is used to perform AC erase to a recording surface of a magnetic disk. The AC erase is performed...
US20090002875 MAGNETIC RECORDING MEDIUM AND METHOD OF FABRICATING THE SAME  
A magnetic recording medium and a method of fabricating the same are provided. The magnetic recording medium in which a position for magnetic recording is patterned with a magnetic material,...
US20150103435 HEAD POSITION DEMODULATING METHOD AND MAGNETIC DISK DEVICE  
According to one embodiment, a head position demodulating method and a magnetic disk device switch a demodulation window such that an amplitude of a fundamental wave component of a null-type burst...
US20060082913 Patterned master carrier for magnetic transfer, magnetic recording medium, and magnetic recording/reproducing apparatus  
Magnetic field absorbing regions, composed of protrusions or magnetic layers, are provided in an amplitude servo transfer pattern of a patterned master carrier for magnetic transfer. The magnetic...

Matches 1 - 50 out of 62 1 2 >