Matches 1 - 18 out of 18
Match Document Document Title
7453664 Positioning control circuit, measurement apparatus for trace information and related method  
A magnetic disk apparatus is configured so as to read trace information from a discrete track recording medium recording the trace information for making a servo locus of a magnetic head trace the...
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...
7450336 Method for improved repeatable run out learning in a disk drive  
A method is disclosed for determining fundamental-frequency repeatable runout (1FRRO) coefficients in a disk drive. The disk drive includes a transducer head, a rotating magnetic disk having a...
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...
RE40545 Servo control appartaus and method using absolute value input signals  
A servo control apparatus and method controls systems at least partially on the basis of an observable variable that has an absolute value functional relationship with the controlled variable and...
7440224 Disk drive servo  
A disk drive includes a disk having a first servo burst written with advancing phase as a radial distance on the disk increases, and a second servo burst written with decreasing phase as a radial...
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,...
7433149 Media surface with servo data in customer data region  
A disk drive stores overhead information corresponding to multiple servo sectors within a dedicated data sector in a customer data region of a data storage disk. The overhead information includes...
7430082 Circuit and method for demodulating a servo position burst  
A new technique for Hard Disk Drive (HDD) servo-burst demodulation is provided. A 4-samples per dibit Discrete Fourier Transform (DFT) amplitude estimation is used to calculate the read-head...
7414809 Servo writing using radially overlapped servo segments  
In accordance with various embodiments, initial servo data are written to a storage medium as a series of radially overlapped spiral segments. Final servo data are thereafter written to the medium...
7408733 Magnetic disk drive and magnetic disk medium  
Embodiments of the invention increase the convenience of a magnetic disk drive for portable use by shortening a period of time required to record a large amount of data, and by increasing the...
7405899 Method for determining read/write head position based on phase detection of a servo pattern  
A method determines RW head radial position relative to tracks within a magnetic data disc. This involves sensing both a S-burst signal and a P-burst signal with the RW head. The S-burst signal and...
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...
7403355 Information recording medium, recording/reproducing apparatus, and stamper  
On an information recording medium, a data track pattern and a servo pattern composed of a concave/convex pattern including a plurality of convex parts are formed on at least one surface of a...
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...
7400468 Vibration detector for hard disk drives  
A hard disk drive with a circuit that provides a control signal to a voice coil motor to move a head across a disk. The disk drive includes a circuit that provides a control signal to the voice...
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...
7397627 Method of detecting position of head for recording medium  
A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each...
Matches 1 - 18 out of 18