JPS5698708A - Magnetic tape control system - Google Patents

Magnetic tape control system

Info

Publication number
JPS5698708A
JPS5698708A JP14980A JP14980A JPS5698708A JP S5698708 A JPS5698708 A JP S5698708A JP 14980 A JP14980 A JP 14980A JP 14980 A JP14980 A JP 14980A JP S5698708 A JPS5698708 A JP S5698708A
Authority
JP
Japan
Prior art keywords
tape
written
dbs
instruction
channel
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
JP14980A
Other languages
Japanese (ja)
Inventor
Masato Mori
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 JP14980A priority Critical patent/JPS5698708A/en
Publication of JPS5698708A publication Critical patent/JPS5698708A/en
Pending legal-status Critical Current

Links

Landscapes

  • Error Detection And Correction (AREA)

Abstract

PURPOSE: To detect abnormal erasure of DB and double writing by counting the number of data block (DB) recorded on a tape until the tape is stopped and by comparing the count value with the number of written DBs that a host device stores.
CONSTITUTION: In response to write instruction C1 from channel 3, data S1 is sent to tape device 1 via buffer 26 and modulator 25 and written on a tape as various DBs. Similarly, a tape mark is written with tape mark write instruction C1. Written DBs are read out with a read instruction and then transferred to channel 3 via demodulator 21, buffer 22 and OR27. On arrival of a space file instruction, tape device 1 is driven to discriminate between DB and the tape mark. In case of DB, it is counted 21 and in case of the tape mark, on the other hand, the driving is stopped. In response to a count read instruction, count value 21 is transferred to channel 3 via OR27 and then compared with the previously stored number of written DBs.
COPYRIGHT: (C)1981,JPO&Japio
JP14980A 1980-01-07 1980-01-07 Magnetic tape control system Pending JPS5698708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14980A JPS5698708A (en) 1980-01-07 1980-01-07 Magnetic tape control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14980A JPS5698708A (en) 1980-01-07 1980-01-07 Magnetic tape control system

Publications (1)

Publication Number Publication Date
JPS5698708A true JPS5698708A (en) 1981-08-08

Family

ID=11465971

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14980A Pending JPS5698708A (en) 1980-01-07 1980-01-07 Magnetic tape control system

Country Status (1)

Country Link
JP (1) JPS5698708A (en)

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