JPS57182249A - File data securing system - Google Patents

File data securing system

Info

Publication number
JPS57182249A
JPS57182249A JP56039785A JP3978581A JPS57182249A JP S57182249 A JPS57182249 A JP S57182249A JP 56039785 A JP56039785 A JP 56039785A JP 3978581 A JP3978581 A JP 3978581A JP S57182249 A JPS57182249 A JP S57182249A
Authority
JP
Japan
Prior art keywords
file
data
blocks
indication
block
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
JP56039785A
Other languages
Japanese (ja)
Inventor
Michiharu Matsubara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56039785A priority Critical patent/JPS57182249A/en
Publication of JPS57182249A publication Critical patent/JPS57182249A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor

Abstract

PURPOSE:To secure stored data even during the interruption of file formation processing by writing an indication, showing occupation, in a scheduled data block when a file is defined, and the rewriting the occupation indication into a different indication once data is written therein. CONSTITUTION:The storage part of a file device 5 is divided into data blocks of constant-length size; and blocks assigned to files are chained, file by file and empty blocks are chained into one. For file formation regarding input information transferred from an input equipment 4 to a main storage device 8, a specified number of empty blocks are unchained from empty blocks in the file device 6 to form a block chain for a new file, and thus empty block chains are renewed; and a file end indication is written in a data block assigned to the new file. Then, opening processing of the file is performed to write the input data, and control information is added before the data. Even if a system fault occurs during data input operation, effective data are discriminated by checking the control information on each data block in the chain.
JP56039785A 1981-03-19 1981-03-19 File data securing system Pending JPS57182249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56039785A JPS57182249A (en) 1981-03-19 1981-03-19 File data securing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56039785A JPS57182249A (en) 1981-03-19 1981-03-19 File data securing system

Publications (1)

Publication Number Publication Date
JPS57182249A true JPS57182249A (en) 1982-11-10

Family

ID=12562584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56039785A Pending JPS57182249A (en) 1981-03-19 1981-03-19 File data securing system

Country Status (1)

Country Link
JP (1) JPS57182249A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056178A1 (en) * 2001-01-12 2002-07-18 Sanyo Electric Co., Ltd. Data recorder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002056178A1 (en) * 2001-01-12 2002-07-18 Sanyo Electric Co., Ltd. Data recorder

Similar Documents

Publication Publication Date Title
US4189781A (en) Segmented storage logging and controlling
EP0332210A2 (en) Backup control method and system in data processing system
DE69403192D1 (en) DEVICE AND METHOD FOR THE DATA BACKUP OF STORAGE UNITS IN A COMPUTER NETWORK
JPH02148235A (en) Data drawback system
EP0240616A1 (en) Method to test and set data in a record on disk in one atomic input/output operation
JPS6433770A (en) Disk controller
JPS57182249A (en) File data securing system
KR880002574B1 (en) File deletion apparatus for bubble cassette memory
US4198681A (en) Segmented storage logging and controlling for partial entity selection and condensing
EP0858631B1 (en) Backup copying of data to a tape unit with a cache memory
JPH0158533B2 (en)
ATE227494T1 (en) METHOD FOR TRANSFERRING FILES FROM A MASS STORAGE DEVICE TO A POST-PROCESSING SYSTEM
JPS5557959A (en) On-line recovery control system
JPH0247735A (en) Computer device
JPS58115562A (en) Generation management system for reused data set
Lynch Description of a high capacity, fast turnaround university computing center
Boyd et al. A Simplified On‐line Circulation System
Bloom et al. Card random access memory (CRAM) functions & use
JPS57146334A (en) Data input system
Gwatking et al. Automatic Erasure of Released Disk Space on an IBM 370 Computer Using the MVS Operating System
Lamprecht et al. File Access
Knott Procedures for managing extendible array files
Dunn SCHOOL OF ARTIFICIAL INTELLIGENCE UNIVERSITY OF EDINBURGH
Berger DFSMS data set I/O statistics.
JPH0816614A (en) Transfer data management method for seal impression retrieving system