GB2205467B - Disk drive controller - Google Patents

Disk drive controller

Info

Publication number
GB2205467B
GB2205467B GB8720026A GB8720026A GB2205467B GB 2205467 B GB2205467 B GB 2205467B GB 8720026 A GB8720026 A GB 8720026A GB 8720026 A GB8720026 A GB 8720026A GB 2205467 B GB2205467 B GB 2205467B
Authority
GB
United Kingdom
Prior art keywords
read
cell
pulses
inch
parameters representing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB8720026A
Other versions
GB2205467A (en
GB8720026D0 (en
Inventor
Wendell Sander
Brian Sander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Apple Inc
Original Assignee
Apple Computer Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Computer Inc filed Critical Apple Computer Inc
Publication of GB8720026D0 publication Critical patent/GB8720026D0/en
Priority to IN135DE1988 priority Critical patent/IN178453B/en
Publication of GB2205467A publication Critical patent/GB2205467A/en
Application granted granted Critical
Publication of GB2205467B publication Critical patent/GB2205467B/en
Priority to SG63492A priority patent/SG63492G/en
Priority to SG63392A priority patent/SG63392G/en
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10212—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter compensation for data shift, e.g. pulse-crowding effects
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
    • G11B20/1252—Formatting, e.g. arrangement of data block or words on the record carriers on discs for discontinuous data, e.g. digital information signals, computer programme data
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B2020/1087—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing
    • G11B2020/10879—Digital recording or reproducing wherein a selection is made among at least two alternative ways of processing the kind of record carrier being the selection criterion
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers

Abstract

A disc drive controller has read post compensation which corrects for peak shift effects on discs with insufficient precompensation. The data is recorded in Manchester (MFM) format and read into circuitry including SCT counter (451) which loads parameters representing a cell with a short-cell (2 unit) following it and LCT counter (453) which loads parameters representing a cell with a long cell (3 or 4 unit) following it. Bound detector 455 counts the number of pulses between transitions and shift registers (457, 459) store the number of pulses generated by the respective counters to enable the bound detector to generate peak shift compensated pulses. The controller has a programmable parameter scheme which makes it possible to read and write 3 1/2 inch variable and fixed speed drives, as well as standard 5 1/4 inch drives. Additionally, there is a plus/minus rate multiplier to correct for symmetry and frequency errors. The use of half clock circuits to provide half clock resolution in the signal being written to and read from the disk is provided with the capability of operating at continuously variable clock speeds and data rates dynamically programmable by the computer. <IMAGE>
GB8720026A 1987-05-28 1987-08-25 Disk drive controller Expired - Fee Related GB2205467B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IN135DE1988 IN178453B (en) 1987-08-25 1988-02-18
SG63492A SG63492G (en) 1987-05-28 1992-06-18 Disk drive controller
SG63392A SG63392G (en) 1987-05-28 1992-06-18 Disk drive controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5544387A 1987-05-28 1987-05-28

Publications (3)

Publication Number Publication Date
GB8720026D0 GB8720026D0 (en) 1987-09-30
GB2205467A GB2205467A (en) 1988-12-07
GB2205467B true GB2205467B (en) 1992-02-12

Family

ID=21997833

Family Applications (3)

Application Number Title Priority Date Filing Date
GB8720026A Expired - Fee Related GB2205467B (en) 1987-05-28 1987-08-25 Disk drive controller
GB9110826A Expired - Fee Related GB2243059B (en) 1987-05-28 1991-05-20 Disk drive controller
GB9110827A Expired - Fee Related GB2243060B (en) 1987-05-28 1991-05-20 Disk drive controller

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB9110826A Expired - Fee Related GB2243059B (en) 1987-05-28 1991-05-20 Disk drive controller
GB9110827A Expired - Fee Related GB2243060B (en) 1987-05-28 1991-05-20 Disk drive controller

Country Status (5)

Country Link
AU (1) AU606409B2 (en)
CA (1) CA1309189C (en)
GB (3) GB2205467B (en)
HK (3) HK72792A (en)
SG (1) SG63592G (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5543975A (en) * 1993-11-12 1996-08-06 Hewlett-Packard Company Removal of precompensation in a write data signal from a flexible disk controller
JP3345515B2 (en) * 1994-08-31 2002-11-18 アイワ株式会社 Peak shift correction circuit and magnetic recording medium reproducing apparatus using the same
TW340262B (en) * 1996-08-13 1998-09-11 Fujitsu Ltd Semiconductor device, system consisting of semiconductor devices and digital delay circuit
GB2355328B (en) * 1996-08-13 2001-05-23 Fujitsu Ltd Semiconductor device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1214737A (en) * 1967-07-17 1970-12-02 Ibm Data signalling systems
GB1242576A (en) * 1967-08-14 1971-08-11 Burroughs Corp Data storage timing system
GB1357949A (en) * 1970-12-07 1974-06-26 Ibm Signal detection and compensation apparatus
GB1397317A (en) * 1971-08-27 1975-06-11 Siemens Ag Distortion-correction systems for pulses derived from magnetic layer stores
GB1415584A (en) * 1972-11-01 1975-11-26 Burroughs Corp Method and apparatus for coded binary data retrieval
GB1424268A (en) * 1972-11-01 1976-02-11 Burroughs Corp Digital data retrieval system with dynamic window skew
GB1466915A (en) * 1973-07-19 1977-03-09 Honeywell Inf Systems Magnetic record reading circuitry
US4281356A (en) * 1979-11-28 1981-07-28 R. C. Sanders Technology Systems, Inc. Magnetic disk memory

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6063704A (en) * 1983-09-19 1985-04-12 Hitachi Ltd Magnetic recorder
US4566044A (en) * 1984-10-29 1986-01-21 International Business Machines Corporation Direction-constrained ternary codes using peak and polarity detection
IT1200426B (en) * 1985-03-21 1989-01-18 Honeywell Inf Systems DIGITAL APPARATUS FOR RECOVERY SYSTEM OF BINARY INFORMATION RECORDED ON MAGNETIC MEDIA

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1214737A (en) * 1967-07-17 1970-12-02 Ibm Data signalling systems
GB1242576A (en) * 1967-08-14 1971-08-11 Burroughs Corp Data storage timing system
GB1357949A (en) * 1970-12-07 1974-06-26 Ibm Signal detection and compensation apparatus
GB1397317A (en) * 1971-08-27 1975-06-11 Siemens Ag Distortion-correction systems for pulses derived from magnetic layer stores
GB1415584A (en) * 1972-11-01 1975-11-26 Burroughs Corp Method and apparatus for coded binary data retrieval
GB1424268A (en) * 1972-11-01 1976-02-11 Burroughs Corp Digital data retrieval system with dynamic window skew
GB1466915A (en) * 1973-07-19 1977-03-09 Honeywell Inf Systems Magnetic record reading circuitry
US4281356A (en) * 1979-11-28 1981-07-28 R. C. Sanders Technology Systems, Inc. Magnetic disk memory

Also Published As

Publication number Publication date
HK95692A (en) 1992-12-11
AU606409B2 (en) 1991-02-07
GB2243060A (en) 1991-10-16
CA1309189C (en) 1992-10-20
SG63592G (en) 1992-09-04
GB2205467A (en) 1988-12-07
GB2243059A (en) 1991-10-16
HK72792A (en) 1992-10-02
AU1475588A (en) 1988-12-01
GB9110827D0 (en) 1991-07-10
GB8720026D0 (en) 1987-09-30
GB9110826D0 (en) 1991-07-10
GB2243059B (en) 1992-02-05
GB2243060B (en) 1992-02-05
HK72892A (en) 1992-10-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950825