JPS57100616A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS57100616A
JPS57100616A JP17686680A JP17686680A JPS57100616A JP S57100616 A JPS57100616 A JP S57100616A JP 17686680 A JP17686680 A JP 17686680A JP 17686680 A JP17686680 A JP 17686680A JP S57100616 A JPS57100616 A JP S57100616A
Authority
JP
Japan
Prior art keywords
write
power
drop
failure
power source
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
JP17686680A
Other languages
Japanese (ja)
Inventor
Katsuji Sadakane
Masayuki Kobayashi
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.)
Tokyo Sanyo Electric Co Ltd
Toshiba TEC Corp
Original Assignee
Tokyo Sanyo Electric Co Ltd
Tokyo Electric Co 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 Tokyo Sanyo Electric Co Ltd, Tokyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP17686680A priority Critical patent/JPS57100616A/en
Publication of JPS57100616A publication Critical patent/JPS57100616A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions

Abstract

PURPOSE:To prevent abnormal data from being written by detecting a drop in a rectified power source output and setting a writing voltage in an unwritten state when it is detected. CONSTITUTION:If a power failure occures during the operation of a disk 1, this power failure is detected by a power-failure detecting circuit 18 as a drop in the output voltage DC2 of a rectifier 17 to generate a power-failure detection signal ES. This detection signal ES energized a relay circuit 19 to change a transfer contact 20 from a write power source 15 side over to an earth side, so that a write power source voltage WBV applied to a write control circuit 11 is held at the earth potential instantaneously. Thus an unwritten state is set to prevent an abnormal write signal from being supplied to a head 3 even if the write control circuit 11 malfunctions owing to a drop in logical driving voltage LMV. Thus, the abnormal data is prevented from being written.
JP17686680A 1980-12-15 1980-12-15 Magnetic disk device Pending JPS57100616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17686680A JPS57100616A (en) 1980-12-15 1980-12-15 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17686680A JPS57100616A (en) 1980-12-15 1980-12-15 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS57100616A true JPS57100616A (en) 1982-06-22

Family

ID=16021171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17686680A Pending JPS57100616A (en) 1980-12-15 1980-12-15 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS57100616A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5928860U (en) * 1982-08-13 1984-02-22 日立電子エンジニアリング株式会社 Loader protection mechanism
JPS60129965A (en) * 1983-12-16 1985-07-11 Matsushita Electric Ind Co Ltd Reading and writing device for magnetic card
JPS61178548U (en) * 1985-04-23 1986-11-07
US4636905A (en) * 1984-10-31 1987-01-13 Citizen Watch Co., Ltd. Voltage monitoring system for an electric power source of a disc drive
JPS6352367A (en) * 1986-08-20 1988-03-05 Sony Corp Recording medium protecting device for disk device
JPH0261803A (en) * 1988-08-26 1990-03-01 Copal Co Ltd Erroneous entry preventing device for magnetic card device
JPH03283004A (en) * 1990-03-30 1991-12-13 Fujitsu Ltd Power abnormality monitor circuit for magnetic disk device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5928860U (en) * 1982-08-13 1984-02-22 日立電子エンジニアリング株式会社 Loader protection mechanism
JPS60129965A (en) * 1983-12-16 1985-07-11 Matsushita Electric Ind Co Ltd Reading and writing device for magnetic card
US4636905A (en) * 1984-10-31 1987-01-13 Citizen Watch Co., Ltd. Voltage monitoring system for an electric power source of a disc drive
JPS61178548U (en) * 1985-04-23 1986-11-07
JPS6352367A (en) * 1986-08-20 1988-03-05 Sony Corp Recording medium protecting device for disk device
JPH0261803A (en) * 1988-08-26 1990-03-01 Copal Co Ltd Erroneous entry preventing device for magnetic card device
JPH03283004A (en) * 1990-03-30 1991-12-13 Fujitsu Ltd Power abnormality monitor circuit for magnetic disk device

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