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JPS57135410A - Floppy disk device - Google Patents

Floppy disk device

Info

Publication number
JPS57135410A
JPS57135410A JP2006281A JP2006281A JPS57135410A JP S57135410 A JPS57135410 A JP S57135410A JP 2006281 A JP2006281 A JP 2006281A JP 2006281 A JP2006281 A JP 2006281A JP S57135410 A JPS57135410 A JP S57135410A
Authority
JP
Japan
Prior art keywords
index track
track
index
signal
sends
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.)
Pending
Application number
JP2006281A
Other languages
Japanese (ja)
Inventor
Wataru Baba
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2006281A priority Critical patent/JPS57135410A/en
Publication of JPS57135410A publication Critical patent/JPS57135410A/en
Pending 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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To prevent loss of a data, by adding an index track to a disk by specific method, so that input and output can be executed by use of the other index track when one index track is faulty. CONSTITUTION:A detecting circuit 20 receives an input information from an amplifier 110, and after that, checks whether a write state of an index track is good or not, and sends a signal to a position setting circuit 10. The setting circuit is constituted so that position signals of the first index track 120 and the second index track 130 are sent to a controlling circuit 50, move the head, and are stored in the index track. When storing a data, the detecting circuit 20 compares the track 120 with contents of the amplifier 110 by inputting the signal, sends a readout impossible signal to the detecting circuit in the event of dissidence, and sends the signal to the position setting circuit 10 so that readout is executed from the second index track 130 thereafter. Even if the first index becomes incapable of detection due to some factor, the signal can be detected from the second index track, therefore, loss of a data is prevented and reliability of this device is elevated.
JP2006281A 1981-02-16 1981-02-16 Floppy disk device Pending JPS57135410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006281A JPS57135410A (en) 1981-02-16 1981-02-16 Floppy disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006281A JPS57135410A (en) 1981-02-16 1981-02-16 Floppy disk device

Publications (1)

Publication Number Publication Date
JPS57135410A true JPS57135410A (en) 1982-08-21

Family

ID=12016592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006281A Pending JPS57135410A (en) 1981-02-16 1981-02-16 Floppy disk device

Country Status (1)

Country Link
JP (1) JPS57135410A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6038764A (en) * 1983-08-11 1985-02-28 Hitachi Ltd Information recording system
JPS60167164A (en) * 1984-02-10 1985-08-30 Hitachi Ltd Recording and playback method of fixed head type PCM recorder
US4849956A (en) * 1985-10-03 1989-07-18 Canon Kabushiki Kaisha Information recording and reproducing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6038764A (en) * 1983-08-11 1985-02-28 Hitachi Ltd Information recording system
JPS60167164A (en) * 1984-02-10 1985-08-30 Hitachi Ltd Recording and playback method of fixed head type PCM recorder
US4849956A (en) * 1985-10-03 1989-07-18 Canon Kabushiki Kaisha Information recording and reproducing apparatus

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