US Patent No: 5,257,143

Number of patents in Portfolio can not be more than 2000

Method and apparatus for positioning head of disk drive using zone-bit-recording

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A zone-bit-recording disk drive has a rotating platter with a surface which is divided into at least two zones each having a respective different number of angularly spaced sectors therein. A method and apparatus for positioning the head relative to the platter surface involve maintaining a count of the number of sectors which pass the head after the platter passes a predetermined angular orientation, ignoring the count during a time interval when the head moves out of a first of the zones toward a second of the zones which contains the specified sector and until the head has entered the second zone and the platter thereafter passes a predetermined angular orientation, and thereafter determining when the count corresponds to the specified sector to be accessed.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
NEC CORPORATIONTOKYO17429

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Zangenehpour, Saied Stevensville, MI 5 184

Cited Art

Patent Info (Count) # Cites Year
 
NEC CORPORATION (1)
4,999,720 Zone density sector counter 24 1989
 
PARADYNE CORPORATION (1)
4,647,991 Disk channel controller 3 1985
 
RESEARCH INVESTMENT NETWORK, INC. (1)
5,050,013 Hard sectoring circuit and method for a rotating disk data storage device 57 1990
 
SPERRY RAND CORPORATION (1)
4,200,928 Method and apparatus for weighting the priority of access to variable length data blocks in a multiple-disk drive data storage system having an auxiliary processing device 23 1978
 
TEXAS INSTRUMENTS INCORPORATED (1)
4,758,944 Method for managing virtual memory to separate active and stable memory blocks 37 1984

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
MARVELL INTERNATIONAL LTD. (37)
5,627,695 System and method for generating unique sector identifiers for an identificationless disk format 59 1995
7,492,545 Method and system for automatic time base adjustment for disk drive servo controllers 0 2003
7,457,903 Interrupt controller for processing fast and regular interrupts 5 2003
7,219,182 Method and system for using an external bus controller in embedded disk controllers 8 2003
7,080,188 Method and system for embedded disk controllers 9 2003
7,064,915 Method and system for collecting servo field data from programmable devices in embedded disk controllers 9 2003
7,039,771 Method and system for supporting multiple external serial port devices using a serial port controller in embedded disk controllers 6 2003
7,111,228 System and method for performing parity checks in disk storage system 8 2003
7,007,114 System and method for padding data blocks and/or removing padding from data blocks in storage controllers 3 2003
7,526,691 System and method for using TAP controllers 1 2003
7,287,102 System and method for concatenating data 5 2004
7,139,150 Method and system for head position control in embedded disk drive controllers 3 2004
7,870,346 Servo controller interface module for embedded disk controllers 2 2004
7,120,084 Integrated memory controller 2 2004
8,166,217 System and method for reading and writing data using storage controllers 0 2004
7,757,009 Storage controllers with dynamic WWN storage modules and methods for managing data and connections between a host and a storage device 0 2004
7,158,058 Method and apparatus for generating a seed set in a data dependent seed selector 28 2004
7,386,661 Power save module for storage controllers 2 2004
7,240,267 System and method for conducting BIST operations 1 2004
7,609,468 Method and system for read gate timing control for storage controllers 3 2005
7,975,110 Method and system for supporting multiple external serial port devices using a serial port controller in embedded disk controllers 0 2006
7,336,435 Method and system for collecting servo field data from programmable devices in embedded disk controllers 0 2006
7,559,009 System and method for performing parity checks in disk storage systems 4 2006
7,596,053 Integrated memory controller 4 2006
7,286,441 Integrated memory controller 2 2006
7,471,485 Method and system for head position control in embedded disk drive controllers 0 2006
7,808,404 Method and apparatus for generating a seed set in a data dependent seed selector 0 2007
7,853,747 Method and system for using an external bus controller in embedded disk controllers 0 2007
8,015,448 System and method for conducting BIST operations 0 2007
7,535,791 Integrated memory controller 0 2007
8,417,900 Power save module for storage controllers 0 2008
7,870,320 Interrupt controller for prioritizing interrupt requests in an embedded disk controller 0 2008
8,116,026 Method and system for head position control in embedded disk drive controllers 0 2008
8,189,285 Method and system for automatic time base adjustment for disk drive servo controllers 0 2009
8,023,217 Method and system for read gate timing control for storage controllers 0 2009
7,984,252 Storage controllers with dynamic WWN storage modules and methods for managing data and connections between a host and a storage device 0 2010
8,370,541 Method and system for processing frames in storage controllers 0 2010
 
MOBILE STORAGE TECHNOLOGY INC. (7)
5,596,458 Variable zone layout for information storage disk drive 40 1994
5,946,153 Information storage disk drive with variable zone layout 8 1996
5,870,237 Method for variable zone layout for information storage disk drive 29 1996
6,260,257 Method of manufacturing an information storage disk drive with variable zone layout and track pitch parameter considerations 27 1997
6,091,559 Variable zone layout and track pitch parameter considerations for information storage disk drive 43 1997
6,005,725 Variable zone layout and track pitch parameter considerations for information storage disk drive 25 1997
7,342,741 Disk drive with variable track density 5 2000
 
RPX CORPORATION (3)
5,812,755 Logical and physical zones for management of defects in a headerless disk drive architecture 31 1995
5,802,584 Hardware alignment in a headerless disk drive architecture 20 1995
6,449,111 Data frame write and read processes 34 1998
 
NEC CORPORATION (2)
5,559,647 Magnetic disk controller which avoids erroneous write operations to ZBR-type magnetic disks upon detection of a next sector mark from the ZBR magnetic disk 3 1995
5,654,835 Magnetic disk controller capable of avoiding erroneous write operations to ZBR-type magnetic disks 2 1995
 
PANASONIC CORPORATION (2)
7,386,222 Audio/video information recording/reproducing device and method therefor 0 2001
8,320,748 Audio/video information recording/reproducing device and method therefor 2008
 
QLOGIC CORPORATION (2)
8,032,674 System and method for controlling buffer memory overflow and underflow conditions in storage controllers 0 2004
7,802,026 Method and system for processing frames in storage controllers 2 2004
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
5,510,905 Video storage server using track-pairing 35 1993
 
HGST NETHERLANDS B.V. (1)
6,023,384 Data recording device and control apparatus for recording data twice on one track using different encoding methods 5 1995
 
MEDIATEK INC. (1)
5,388,085 Apparatus and method for accessing sectors of a rotating disk 7 1993
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
5,418,659 Reliable time-domain demarcation of split formats in embedded-servo, zoned-data recording disk drives 9 1993
 
SAMSUNG ELECTRONICS CO., LTD. (1)
6,081,399 Disk drive having double heads and method for controlling head switching 4 1996