GB1404541A - Information storage system - Google Patents
Information storage systemInfo
- Publication number
- GB1404541A GB1404541A GB2360773A GB2360773A GB1404541A GB 1404541 A GB1404541 A GB 1404541A GB 2360773 A GB2360773 A GB 2360773A GB 2360773 A GB2360773 A GB 2360773A GB 1404541 A GB1404541 A GB 1404541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- defect
- recorded
- block
- track
- data
- 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
Links
- 230000007547 defect Effects 0.000 abstract 13
- 238000009877 rendering Methods 0.000 abstract 1
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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1883—Methods for assignment of alternate areas for defective areas
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Abstract
1404541 Recording data; avoiding defects INTERNATIONAL BUSINESS MACHINES CORP 17 May 1973 [7 June 1972] 23607/73 Headings G4A and G5R Data is recorded serially in tracks along a record medium, e.g. magnetic disc, each track having a pre-recorded indication of whether it contains a defect rendering a portion of the track unusable and of the distance of the defect from a fixed reference point, and the recording system includes control means responsive to the pre-recorded defect indication to record data in such a way as to avoid defects. Each track of a magnetic disc includes a pre-recorded field indicating whether the track contains a defect and the distance of such a defect from an index mark denoting the start of the track. The data is recorded in record blocks separated by gaps, each block including a control field, and one or more further fields, including data fields, separated by gaps. The control field includes an indication of the lengths of various parts of the block together with address information and an indication of the distance from the block to the defect (if present), the last value being recalculated and recorded as each new block is recorded. A check is made for each block as to whether the defect will affect its recording by comparing the calculated defect distance and the block length. If a block would be affected a check is made to determine whether the defect will be wholly contained within an inter-field gap, whether the defect can be avoided by extending one of the gaps by a fixed length along the track, or whether it will be necessary to split one of the fields and introduce a gap of the fixed length. If the defect lies within a gap no action is taken and the block is recorded normally, otherwise the disc is carried through a complete revolution and the control field is re-recorded to indicate what action is being taken and the block is recorded appropriately. The control field is used to control the corrct read-out of shifted and split fields.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26068472A | 1972-06-07 | 1972-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1404541A true GB1404541A (en) | 1975-09-03 |
Family
ID=22990179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2360773A Expired GB1404541A (en) | 1972-06-07 | 1973-05-17 | Information storage system |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5751162B2 (en) |
| AU (1) | AU475711B2 (en) |
| BE (1) | BE799689A (en) |
| BR (1) | BR7304237D0 (en) |
| CA (1) | CA1020666A (en) |
| CH (1) | CH561448A5 (en) |
| DE (1) | DE2328025C3 (en) |
| DK (1) | DK143580C (en) |
| FR (1) | FR2188235B1 (en) |
| GB (1) | GB1404541A (en) |
| IT (1) | IT998117B (en) |
| NL (1) | NL181533C (en) |
| SE (1) | SE393208B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0845780A4 (en) * | 1995-08-18 | 1999-06-09 | Matsushita Electric Industrial Co Ltd | INFORMATION RECORDING AND REPRODUCING DEVICE AND INFORMATION RECORDING AND REPRODUCING MEDIUM |
| WO2001031651A1 (en) * | 1999-10-28 | 2001-05-03 | Seagate Technology Llc | Sync byte padding |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2073935B (en) * | 1980-04-11 | 1983-12-21 | Rca Corp | Tape format to facilitate error concealment and apparatus for recording and/or replaying same |
| JPS6095654A (en) * | 1983-10-28 | 1985-05-29 | Sharp Corp | Plural file managing system |
| JPS6297177A (en) * | 1985-10-24 | 1987-05-06 | Nec Corp | Magnetic tape device |
| JPH0668886B2 (en) * | 1986-11-10 | 1994-08-31 | 株式会社日立製作所 | Defect avoidance control method for magnetic disk |
| DE3739161C2 (en) * | 1987-11-19 | 2000-06-15 | Grundig Ag | Method for recording and reproducing information signals on and from a recording medium |
| JPH0719393B2 (en) * | 1992-03-30 | 1995-03-06 | 株式会社日立製作所 | Optical information processing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2937368A (en) * | 1956-12-12 | 1960-05-17 | Bell Telephone Labor Inc | Means for detecting marking and bypassing defective areas in a magnetic record medium |
| US3588855A (en) * | 1968-10-14 | 1971-06-28 | Ibm | Data gap responding apparatus |
| JPS474054U (en) * | 1971-01-28 | 1972-09-08 |
-
1973
- 1973-05-03 SE SE7306179A patent/SE393208B/en unknown
- 1973-05-10 JP JP5121873A patent/JPS5751162B2/ja not_active Expired
- 1973-05-11 FR FR7317612A patent/FR2188235B1/fr not_active Expired
- 1973-05-15 CA CA171,583A patent/CA1020666A/en not_active Expired
- 1973-05-17 BE BE131241A patent/BE799689A/en not_active IP Right Cessation
- 1973-05-17 GB GB2360773A patent/GB1404541A/en not_active Expired
- 1973-05-25 IT IT2458073A patent/IT998117B/en active
- 1973-05-25 CH CH750773A patent/CH561448A5/xx not_active IP Right Cessation
- 1973-05-28 AU AU56201/73A patent/AU475711B2/en not_active Expired
- 1973-06-01 DE DE19732328025 patent/DE2328025C3/en not_active Expired
- 1973-06-06 BR BR423773A patent/BR7304237D0/en unknown
- 1973-06-06 DK DK312973A patent/DK143580C/en active
- 1973-06-07 NL NL7307989A patent/NL181533C/en active Search and Examination
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0845780A4 (en) * | 1995-08-18 | 1999-06-09 | Matsushita Electric Industrial Co Ltd | INFORMATION RECORDING AND REPRODUCING DEVICE AND INFORMATION RECORDING AND REPRODUCING MEDIUM |
| US6223302B1 (en) | 1995-08-18 | 2001-04-24 | Matsushita Electric Industrial Co., Ltd. | Information recording/reproducing unit and information recording/reproducing data |
| WO2001031651A1 (en) * | 1999-10-28 | 2001-05-03 | Seagate Technology Llc | Sync byte padding |
| US6301679B1 (en) | 1999-10-28 | 2001-10-09 | Seagate Technology Llc | Sync byte padding |
| GB2369483A (en) * | 1999-10-28 | 2002-05-29 | Seagate Technology Llc | Sync byte padding |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2188235B1 (en) | 1976-11-12 |
| IT998117B (en) | 1976-01-20 |
| NL181533B (en) | 1987-04-01 |
| CA1020666A (en) | 1977-11-08 |
| DE2328025C3 (en) | 1975-11-06 |
| AU5620173A (en) | 1974-11-28 |
| DE2328025A1 (en) | 1973-12-20 |
| NL181533C (en) | 1987-09-01 |
| SE393208B (en) | 1977-05-02 |
| BE799689A (en) | 1973-09-17 |
| DE2328025B2 (en) | 1975-03-27 |
| CH561448A5 (en) | 1975-04-30 |
| AU475711B2 (en) | 1976-09-02 |
| FR2188235A1 (en) | 1974-01-18 |
| NL7307989A (en) | 1973-12-11 |
| DK143580B (en) | 1981-09-07 |
| BR7304237D0 (en) | 1974-07-25 |
| JPS4952612A (en) | 1974-05-22 |
| JPS5751162B2 (en) | 1982-10-30 |
| DK143580C (en) | 1982-01-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920517 |