JPS5794960A - Head crush detection system of magnetic disk device - Google Patents

Head crush detection system of magnetic disk device

Info

Publication number
JPS5794960A
JPS5794960A JP16989780A JP16989780A JPS5794960A JP S5794960 A JPS5794960 A JP S5794960A JP 16989780 A JP16989780 A JP 16989780A JP 16989780 A JP16989780 A JP 16989780A JP S5794960 A JPS5794960 A JP S5794960A
Authority
JP
Japan
Prior art keywords
dust
cause
head crush
head
disk
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
JP16989780A
Other languages
Japanese (ja)
Inventor
Tatsuo Fujioka
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 JP16989780A priority Critical patent/JPS5794960A/en
Publication of JPS5794960A publication Critical patent/JPS5794960A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent head crush by introducing part of air in a disk room into the dust detector of a detection room and by moving a magnetic head away from a disk according to the amount of dust, etc.
CONSTITUTION: Sample air is sucked from a pickup 11 in a housing 2 to a dust detector D through a dust suction intake 16, and a photomultiplier tube detects the diameter of each passing dust and the number of them to send outputs to a discriminating circuit 17. When dusts large enough to cause head crush, etc., are detected more than as many as prescribed, a signal (b) is outputted to a driving circuit 19 to operate an access mechanism, which puts a magnetic head off a disk. If the dust is not large enough to cause the head crush, but may cause an accident of the kind if left as it is, a warning is made by a signal (a).
COPYRIGHT: (C)1982,JPO&Japio
JP16989780A 1980-12-02 1980-12-02 Head crush detection system of magnetic disk device Pending JPS5794960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16989780A JPS5794960A (en) 1980-12-02 1980-12-02 Head crush detection system of magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16989780A JPS5794960A (en) 1980-12-02 1980-12-02 Head crush detection system of magnetic disk device

Publications (1)

Publication Number Publication Date
JPS5794960A true JPS5794960A (en) 1982-06-12

Family

ID=15894985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16989780A Pending JPS5794960A (en) 1980-12-02 1980-12-02 Head crush detection system of magnetic disk device

Country Status (1)

Country Link
JP (1) JPS5794960A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59162666A (en) * 1983-03-04 1984-09-13 Fujitsu Ltd File protection system
JPS6185680A (en) * 1984-10-02 1986-05-01 Fuji Photo Film Co Ltd Rotary magnetic recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59162666A (en) * 1983-03-04 1984-09-13 Fujitsu Ltd File protection system
JPS6360461B2 (en) * 1983-03-04 1988-11-24
JPS6185680A (en) * 1984-10-02 1986-05-01 Fuji Photo Film Co Ltd Rotary magnetic recording and reproducing device

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