GB2121654A - Track identification code recording method - Google Patents
Track identification code recording methodInfo
- Publication number
- GB2121654A GB2121654A GB08317981A GB8317981A GB2121654A GB 2121654 A GB2121654 A GB 2121654A GB 08317981 A GB08317981 A GB 08317981A GB 8317981 A GB8317981 A GB 8317981A GB 2121654 A GB2121654 A GB 2121654A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- identification code
- data
- track identification
- transition
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59633—Servo formatting
- G11B5/59655—Sector, sample or burst servo format
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
Abstract
In a magnetic disc for a magnetic disc storage system, at least one of the surfaces of the disc being coated with a magnetic material, the disc being adapted to be mounted on a spindle for rotation relative to a magnetic transducer positioned for recording data on and retrieving data from the surface, a plurality of concentric annular tracks (2, 1, 0, 15) being defined on the surface of the disc, each of the tracks being divided into a plurality of sectors, each such sector having associated therewith prerecorded data for identification thereof, the prerecorded identification data including a track identification code, the track identification code being a unit distance code, there is disclosed a method for recording the unit distance track identification code wherein the code has a first uni-directional clock transition (61) at a fixed time in each bit cell and a second uni-directional transition (N-N) at a variable time in each bit cell, the time of the second transition relative to the first transition determining whether the data bit is a one or a zero.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US32188681A | 1981-11-16 | 1981-11-16 | |
PCT/US1982/000386 WO1983001859A1 (en) | 1981-11-16 | 1982-04-01 | Track identification code recording method |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8317981D0 GB8317981D0 (en) | 1983-08-03 |
GB2121654A true GB2121654A (en) | 1983-12-21 |
Family
ID=23252463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08317981A Withdrawn GB2121654A (en) | 1981-11-16 | 1982-04-01 | Track identification code recording method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0093713A4 (en) |
JP (1) | JPS58501879A (en) |
BR (1) | BR8207978A (en) |
GB (1) | GB2121654A (en) |
WO (1) | WO1983001859A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8702903A (en) * | 1987-12-03 | 1989-07-03 | Philips Nv | METHOD AND APPARATUS FOR RECORDING INFORMATION ON A RECORD CARRIER, AND AN APPARATUS FOR READING THE RECORDED INFORMATION. |
EP0332056A1 (en) * | 1988-03-07 | 1989-09-13 | Siemens Aktiengesellschaft | Magnetic disc storage device with position control information recorded on a separate servo surface |
US4977472A (en) * | 1988-03-28 | 1990-12-11 | Seagate Technology, Inc. | Servo address system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3281806A (en) * | 1962-12-21 | 1966-10-25 | Honeywell Inc | Pulse width modulation representation of paired binary digits |
US4027338A (en) * | 1975-04-28 | 1977-05-31 | Burroughs Corporation | Transducer positioning system for providing coarse positioning |
FR2346806A1 (en) * | 1976-03-31 | 1977-10-28 | Honeywell Bull Soc Ind | MODE OF WRITING ADDRESS ON MAGNETIC RECORDING MEDIUM |
FR2417824A1 (en) * | 1978-02-17 | 1979-09-14 | Cii Honeywell Bull | HOW TO WRITE INFORMATION ON A MAGNETIC RECORDING MEDIA |
FR2439435A1 (en) * | 1978-10-19 | 1980-05-16 | Cii Honeywell Bull | WAY OF WRITING INFORMATION ON A MAGNETIC RECORDING MEDIUM |
GB2060941B (en) * | 1979-08-22 | 1983-11-02 | Cii Honeywell Bull | Method for displacement of a movable system with respect to a data carrier and a device for carrying it out |
FR2470425A1 (en) * | 1979-11-19 | 1981-05-29 | Cii Honeywell Bull | METHOD FOR MEASURING THE POSITION OF A READ-WRITE HEAD OF INFORMATION OF A MEDIUM IN RELATION TO A REFERENCE POSITION THEREOF AND DEVICE FOR IMPLEMENTING IT |
-
1982
- 1982-04-01 WO PCT/US1982/000386 patent/WO1983001859A1/en not_active Application Discontinuation
- 1982-04-01 EP EP19820901280 patent/EP0093713A4/en not_active Withdrawn
- 1982-04-01 BR BR8207978A patent/BR8207978A/en unknown
- 1982-04-01 GB GB08317981A patent/GB2121654A/en not_active Withdrawn
- 1982-04-01 JP JP82501418A patent/JPS58501879A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
GB8317981D0 (en) | 1983-08-03 |
JPS58501879A (en) | 1983-11-04 |
BR8207978A (en) | 1983-10-04 |
EP0093713A4 (en) | 1985-09-16 |
WO1983001859A1 (en) | 1983-05-26 |
EP0093713A1 (en) | 1983-11-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |