EP0127732A2
Expired / Lapsed
EP
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Information recording system
Assignee: Hitachi Ltd
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Filing: 1984-03-08
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Granted: —
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Expires: 2004-03-08
Abstract
Abstract An information recording method and system for writing information onto a recording medium. If an error area is detected in a check of the information read out of the medium after writing, the information is rewritten onto an alternative area on the recording medium using a buffer memory (34), while the information in the error area is kept valid. Loss time for accessing the alternative area is eliminated until the error checking and correction in the error checking and correction circuit (38) is not available for the information read out of the error area through a reading circuit (31, 32).
Inventors
- 👤 Mikito Ogata
- 👤 Masahito Mori
- 👤 Takashi Doi
- 👤 Michio Miyazaki
- 👤 Takafumi Oka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 09:03
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B20/1816; G11B20/1833; G11B2020/183; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
An information recording method for reading information after said information has been written onto a record medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting alternative information for the information of said record error area into a different area on said record medium, characterized by rewriting the information into said different area while the information of said record error area is kept valid.
Claim 2
Dependent Claim
71 words
An information recording method for reading information after said information has been written onto a record medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting alternative information for the information of said record error area into a different area on said record medium, characterized by rewriting the information into said different area while the information of said record error area is kept valid.
Claim 3
Dependent Claim
35 words
An information recording method according to Claim 1, wherein when the information is rewritten into said different area, an indicia for indicating the presence of the alternative area is recorded in said record error area.
Claim 4
Dependent Claim
96 words
An information recording and reproducing method for reading information after said information has been written onto a record medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting alternative information for the information of said record error area into a different area on said record medium while the information in said record error area is kept valid, and in a subsequent information read operation, checking the read information under a different criterion from said predetermined criterion, and accessing the alternative area for an area determined as an error area.
Claim 5
Dependent Claim
96 words
An information recording and reproducing method for reading information after said information has been written onto a record medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting alternative information for the information of said record error area into a different area on said record medium while the information in said record error area is kept valid, and in a subsequent information read operation, checking the read information under a different criterion from said predetermined criterion, and accessing the alternative area for an area determined as an error area.
Claim 6
Dependent Claim
81 words
An information recording and reproducing method according to Claim 3, wherein the information is written together with an error check and correction code in every record area onto the record medium, the check of the read information for preparing the alternative area is made on the read information uncorrected by the error check and correction code, and checks of the read information in the usual read operation are made on the read information corrected by the error check and correction code.
Claim 7
Dependent Claim
157 words
An information recording and reproducing method using a recording medium having a plurality of tracks each devided into a plurality of areas comprising: (a) a step for writing an information provided from a host apparatus on the tracks excluding at least one vacant area reserved for an alternative area in the recording medium, (b) a step for reading the information from one of the tracks in the recording medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting the information into an unused alternative area in the one track while the information in said record area is kept valid, and (c) a step for reading the information written in several areas of the one track, and if the record error area which does not meet another criterion from the predetermined criterion is detected, providing the corresponding information written in the alternative area on the one track to a host apparatus.
Claim 8
Dependent Claim
157 words
An information recording and reproducing method using a recording medium having a plurality of tracks each devided into a plurality of areas comprising: (a) a step for writing an information provided from a host apparatus on the tracks excluding at least one vacant area reserved for an alternative area in the recording medium, (b) a step for reading the information from one of the tracks in the recording medium, and if a record error area which does not meet a predetermined criterion is detected, rewriting the information into an unused alternative area in the one track while the information in said record area is kept valid, and (c) a step for reading the information written in several areas of the one track, and if the record error area which does not meet another criterion from the predetermined criterion is detected, providing the corresponding information written in the alternative area on the one track to a host apparatus.
Claim 9
Dependent Claim
76 words
An information recording and reproducing method according to Claim 5, wherein the information is written with an error check and correction code in every record area onto the record medium, the check of the read information for preparing the alternative area is made on the read information uncorrected by the error check and correction code, and successive checks of the read information are made on the read information corrected by the error check and correction code.
Claim 10
Dependent Claim
187 words
An information reproducing system using a recording medium having a plurality of tracks each devided into a plurality of record areas for recording information written with an error check and correction code, each of said tracks including at least one alternative area for recording the information to be recorded in one of said record area if said record area is detected as a record error area which does not meet a predetermined criterion, comprising: read out means (31, 32, 33) for reading the information from one of the tracks in said recording medium, data correcting means (37, 38) for correcting the information in respective record area provided from said read out means by using said error check and correction code and for producing a status signal which indicates the detection of an error area uncorrected by the error check and correction code, memory means (34A, 34B) for storing at least one track of information provided from said data correcting means, and output means for outputting the information stored in said memory means by replacing the record error area with said alternative area according to said status signal.
Claim 11
Dependent Claim
187 words
An information reproducing system using a recording medium having a plurality of tracks each devided into a plurality of record areas for recording information written with an error check and correction code, each of said tracks including at least one alternative area for recording the information to be recorded in one of said record area if said record area is detected as a record error area which does not meet a predetermined criterion, comprising: read out means (31, 32, 33) for reading the information from one of the tracks in said recording medium, data correcting means (37, 38) for correcting the information in respective record area provided from said read out means by using said error check and correction code and for producing a status signal which indicates the detection of an error area uncorrected by the error check and correction code, memory means (34A, 34B) for storing at least one track of information provided from said data correcting means, and output means for outputting the information stored in said memory means by replacing the record error area with said alternative area according to said status signal.
References Cited (Backward Citations)
No citation records indexed.
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