JPS564855A - Control system for command retrial - Google Patents

Control system for command retrial

Info

Publication number
JPS564855A
JPS564855A JP7820779A JP7820779A JPS564855A JP S564855 A JPS564855 A JP S564855A JP 7820779 A JP7820779 A JP 7820779A JP 7820779 A JP7820779 A JP 7820779A JP S564855 A JPS564855 A JP S564855A
Authority
JP
Japan
Prior art keywords
retrial
command
strobe
offset
readout
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
JP7820779A
Other languages
Japanese (ja)
Inventor
Katsuo Yoshida
Kazunobu Mimura
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 JP7820779A priority Critical patent/JPS564855A/en
Publication of JPS564855A publication Critical patent/JPS564855A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To efficiently perform the command retrial, by selecting the offset state and the strobe state based on the result of past command retrial, when an error is produced to the data from a magnetic disc drive unit.
CONSTITUTION: If an error is detected in the readout data from the magnetic disc drive unit 1, the command retrial is made while changing the offset state of head and readout strobe state based on the algorithm determined with the microprogram in advance. The number of success of retrials is stored in the offset memory section 6 and the strobe memory section 7, and when errors are repeated in the readout data, the command retrial is sequentially made from the combination having greater sum of the number of success.
COPYRIGHT: (C)1981,JPO&Japio
JP7820779A 1979-06-22 1979-06-22 Control system for command retrial Pending JPS564855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7820779A JPS564855A (en) 1979-06-22 1979-06-22 Control system for command retrial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7820779A JPS564855A (en) 1979-06-22 1979-06-22 Control system for command retrial

Publications (1)

Publication Number Publication Date
JPS564855A true JPS564855A (en) 1981-01-19

Family

ID=13655579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7820779A Pending JPS564855A (en) 1979-06-22 1979-06-22 Control system for command retrial

Country Status (1)

Country Link
JP (1) JPS564855A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6381725B1 (en) 1998-08-18 2002-04-30 Fujitsu Limited Disk device and data error correction method thereof
US6687194B1 (en) 1998-12-15 2004-02-03 Fujitsu Limited Optical storing apparatus and reproducing method for correcting read errors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6381725B1 (en) 1998-08-18 2002-04-30 Fujitsu Limited Disk device and data error correction method thereof
US6687194B1 (en) 1998-12-15 2004-02-03 Fujitsu Limited Optical storing apparatus and reproducing method for correcting read errors

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