JPS63273291A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS63273291A
JPS63273291A JP10776587A JP10776587A JPS63273291A JP S63273291 A JPS63273291 A JP S63273291A JP 10776587 A JP10776587 A JP 10776587A JP 10776587 A JP10776587 A JP 10776587A JP S63273291 A JPS63273291 A JP S63273291A
Authority
JP
Japan
Prior art keywords
write
circuit
switch
gate
goes
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
JP10776587A
Other languages
Japanese (ja)
Inventor
Naomi Takahata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP10776587A priority Critical patent/JPS63273291A/en
Publication of JPS63273291A publication Critical patent/JPS63273291A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To perform write protection by a user side, by providing a write protect with set in parallel with an internal switch at the outside of a cabinet incorporating a data write circuit and the write protect switch which operates the circuit.
CONSTITUTION: At the outside of the cabinet incorporating the write protect switch 1, a pull-up resistor 2, an AND gate 3, and the data write control circuit 4, the write protect switch 5 is provided additionally in parallel with the switch 1. In the circuit, the output O of the AND gate 3 goes to a high level when both two inputs I1 and I2 are high levels, and the circuit 4 is set at a state possible to write data. The input I1 on one side of the gate 3 is connected to the switches 1 and 5, and the I2 on the other side is connected to the line of a write gate signal WG. Also, when the signal WG goes to the high level, the output O of the gate 3 goes to a low level, then, the circuit 4 is set at a state prohibiting write. Such operation can be realized by the switch 5.
COPYRIGHT: (C)1988,JPO&Japio
JP10776587A 1987-04-30 1987-04-30 Magnetic disk device Pending JPS63273291A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10776587A JPS63273291A (en) 1987-04-30 1987-04-30 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10776587A JPS63273291A (en) 1987-04-30 1987-04-30 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS63273291A true JPS63273291A (en) 1988-11-10

Family

ID=14467430

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10776587A Pending JPS63273291A (en) 1987-04-30 1987-04-30 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS63273291A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10339328B1 (en) 2014-07-15 2019-07-02 Cru Acquisition Group, Llc Securing stored computer files from modification

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10339328B1 (en) 2014-07-15 2019-07-02 Cru Acquisition Group, Llc Securing stored computer files from modification
US10936742B1 (en) 2014-07-15 2021-03-02 Cru Data Security Group, Llc Systems and methods for securing stored computer files from modification

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