JPS637562A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS637562A
JPS637562A JP15110686A JP15110686A JPS637562A JP S637562 A JPS637562 A JP S637562A JP 15110686 A JP15110686 A JP 15110686A JP 15110686 A JP15110686 A JP 15110686A JP S637562 A JPS637562 A JP S637562A
Authority
JP
Japan
Prior art keywords
magnetic disk
temperature gradient
control circuit
temperature
signal
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
JP15110686A
Other languages
Japanese (ja)
Inventor
Seiji Takahashi
高橋 精治
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP15110686A priority Critical patent/JPS637562A/en
Publication of JPS637562A publication Critical patent/JPS637562A/en
Pending legal-status Critical Current

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  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE:To improve the reliability of a bit of recording information against change in temperature environment, by providing a temperature gradient detecting means which detects a temperature gradient in a magnetic disk device, and includes a sending means of a signal which instructs to prohibit the operation of a magnetic recording means when the temperature gradient exceeds a prescribed value. CONSTITUTION:A temperature detector 6, a converter 7, and a temperature gradient arithmetic circuit 8 find the temperature gradient in the magnetic disk device, and output a control signal to a control circuit 4 when abnormality exists in the temperature gradient. By inputting a start indication signal ST from an operation start button in a host device 5, or the magnetic disk device, to the control circuit 4, a magnetic disk medium 1 starts to rotate, and the control circuit 4 performs the initialization of a magnetic head 2, and the control circuit 4 itself. Also, while an abnormal signal representing the abnormality of the temperature gradient is sent from the temperature gradient arithmetic circuit 8 to the control circuit 4, the control circuit 4 does not send a ready signal to the host device 5, and simultaneously, prohibits the readout and the write of data on the magnetic disk medium 1. In such a way, it is possible to prevent the reliability of a record data in case of using a device under abnormal temperature environment from deteriorating.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高記録密度方式の磁気ディスク装置に関する
。特に、温度環境の変化に対して記録情報の信頼性を向
上させる磁気ディスク装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high recording density type magnetic disk device. In particular, the present invention relates to a magnetic disk device that improves the reliability of recorded information against changes in temperature environment.

〔概 要〕〔overview〕

本発明は、高記録密度方式の磁気ディスク装置において
、 磁気ディスク装置内にその温度勾配を検出し、検出され
る温度勾配が所定値以上である場合に、制御回路を介し
て磁気ディスク媒体に対してデータの書き込みおよび読
み出しを禁止することにより、 温度環境の変化に対して記録情報の信頼性を向上させる
ことができるようにしたものである。
The present invention detects a temperature gradient within the magnetic disk device in a high recording density type magnetic disk device, and when the detected temperature gradient is equal to or higher than a predetermined value, controls the magnetic disk medium through a control circuit. By prohibiting data writing and reading, it is possible to improve the reliability of recorded information against changes in temperature environment.

〔従来の技術〕[Conventional technology]

従来の磁気ディスク装置は、環境温度が急激に変動し、
磁気ディスク媒体あるいは磁気ヘッドの熱膨張により、
磁気ヘッドの位置決め精度が劣化しても、記録密度が低
く記録トランクの間隔が広いために、磁気ディスク装置
の性能にはほとんど影響を与えなかった。
Conventional magnetic disk drives suffer from rapid fluctuations in environmental temperature.
Due to thermal expansion of the magnetic disk medium or magnetic head,
Even if the positioning accuracy of the magnetic head deteriorated, it had little effect on the performance of the magnetic disk device because of the low recording density and wide spacing between recording trunks.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ところが最近では、記録トラ・ツク間隔を狭めた高記録
密度方式の磁気ディスク装置が開発されている。
However, recently, high recording density magnetic disk drives with narrower recording track intervals have been developed.

このような磁気ディスク装置で問題になる点の一つに、
環境温度の急激な変化により発生するオフトラック現象
がある。すなわち、温度変化で磁気ディスク媒体が膨張
するあるいは内部の部品が微妙にずれることにより、磁
気ヘッドがデータを登録する(または登録済み)領域(
トランク)からずれ、該当するトラ・ツクに正確にデー
タを書き込む(または読み出す)ことができなくなる問
題点があった。したがって、環境温度が急激に変化した
場合には、記録情報の信頼性が著しく低下することにな
る。
One of the problems with such magnetic disk devices is that
There is an off-track phenomenon that occurs due to sudden changes in environmental temperature. In other words, when the magnetic disk medium expands due to temperature changes or when internal parts shift slightly, the area where the magnetic head registers (or has already registered) data changes (
There was a problem that data could not be accurately written to (or read from) the corresponding trunk. Therefore, if the environmental temperature suddenly changes, the reliability of recorded information will drop significantly.

本発明は、このような従来の問題点を解決するもので、
温度環境の変化に対して記録情報の信頌性を向上させる
ことができる磁気ディスク装置を提供することを目的と
する。
The present invention solves these conventional problems,
An object of the present invention is to provide a magnetic disk device that can improve the authenticity of recorded information against changes in temperature environment.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、上位装置に接続され、この上位装置からの制
御信号により磁気記録手段の駆動制御を行う制御回路を
含む磁気ディスク装置において、磁気ディスク装置内に
その温度勾配を検出し、検出される温度勾配が所定値以
上である場合に、上記制御回路に対して上記磁気記録手
段の動作の禁止を指示する信号を送出する手段を含む温
度勾配検出手段を備えたことを特徴とする。
The present invention relates to a magnetic disk device that is connected to a host device and includes a control circuit that controls the drive of a magnetic recording means based on a control signal from the host device, in which a temperature gradient is detected within the magnetic disk device. The present invention is characterized by comprising temperature gradient detection means including means for sending a signal to the control circuit to instruct prohibition of operation of the magnetic recording means when the temperature gradient is equal to or higher than a predetermined value.

〔作 用〕[For production]

本発明は、磁気ディスク装置内の温度を検出し、その温
度変化の割合(温度勾配)が所定値以上である場合に、
制御回路を介して磁気ディスク媒体に対してデータの書
き込みおよび読み出しを行うリードライト回路の動作を
禁止する。
The present invention detects the temperature inside a magnetic disk device, and when the rate of temperature change (temperature gradient) is equal to or higher than a predetermined value,
The operation of the read/write circuit that writes data to and reads data from the magnetic disk medium via the control circuit is prohibited.

〔実施例〕〔Example〕

以下、本発明の実施例方式を図面に基づいて説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

図は、本発明の一実施例を示すブロック構成図である0
図において、参照番号1は磁気ディスク媒体、参照番号
2はこの磁気ディスク媒体1にデータを書き込むあるい
は読み出す磁気ヘッドである。磁気ヘッド2はそれを駆
動するリードライト回路3に接続され、さらに制御回路
4を介して上位装置(磁気ディスクコントロール装置)
5に接続される。制御回路4と上位装置5との間では、
制御信号およびデータ信号の授受が行われ、制御回路4
の指令によりリードライト回路3が動作する。
The figure is a block diagram showing one embodiment of the present invention.
In the figure, reference numeral 1 is a magnetic disk medium, and reference numeral 2 is a magnetic head for writing data to or reading data from the magnetic disk medium 1. As shown in FIG. The magnetic head 2 is connected to a read/write circuit 3 that drives it, and is further connected to a host device (magnetic disk control device) via a control circuit 4.
Connected to 5. Between the control circuit 4 and the host device 5,
Control signals and data signals are exchanged, and the control circuit 4
The read/write circuit 3 operates according to the command.

また、制御回路4には磁気ディスク装置の1iaオンに
よるスタート指示信号STが入力される。
Further, a start instruction signal ST is input to the control circuit 4 by turning on 1ia of the magnetic disk device.

なお、磁気ヘッド2の位置決めを行うヘッド位置決め機
構は図面では省略されている。
Note that a head positioning mechanism for positioning the magnetic head 2 is omitted in the drawing.

本発明の特徴は、磁気ディスク装置内の温度を検出する
温度検出器6、その出力を電気信号に変換する変換器7
およびその出力から温度勾配を演算して所定値と比較し
、異常がある場合に制御回路4に制御信号を出力する温
度勾配演算回路8を備えるところにある。
The features of the present invention include a temperature detector 6 that detects the temperature inside the magnetic disk drive, and a converter 7 that converts the output into an electrical signal.
A temperature gradient calculation circuit 8 is provided which calculates a temperature gradient from the output thereof, compares it with a predetermined value, and outputs a control signal to the control circuit 4 if there is an abnormality.

温度検出器6、変換器7および温度勾配演算回路8は、
磁気ディスク装置内の温度勾配を求めるための原理的な
構成例である。したがって、磁気ディスク装置内の温度
勾配を直接検出することができる温度勾配検出回路によ
り、その温度勾配に異常がある場合に制御回路4に制御
信号を出力する構成としてもよい。
The temperature detector 6, converter 7 and temperature gradient calculation circuit 8 are
This is an example of a basic configuration for determining a temperature gradient within a magnetic disk device. Therefore, a configuration may be adopted in which a temperature gradient detection circuit that can directly detect the temperature gradient within the magnetic disk drive outputs a control signal to the control circuit 4 when there is an abnormality in the temperature gradient.

本発明磁気ディスク装置は、上位装置5または磁気ディ
スク装置内の動作開始ボタンからのスタート指示信号S
Tが制御回路4に入力されることにより、磁気ディスク
媒体lが回転を始め、制御回路4は磁気ヘッド2および
制御回路4自身の初期化動作を行う。温度勾配演算回路
8から制御回路4に異常信号が送出されていない場合に
は、制御回路4は初期化動作が終了した時点で、上位装
置5に磁気ディスク装置が上位装置5に対して使用可能
状態になったことをレディ信号により通知する。温度勾
配演算回路8から制御回路4に温度勾配が異常であるこ
とを示す異常信号が送られている場合には、制御回路4
は初期化動作が終了しても、上位装置5にレディ信号を
送出せず、同時にリードライト回路3に指令を出し、磁
気ディスク媒体1のデータの読み出しおよび書き込みを
禁止する。
The magnetic disk device of the present invention receives a start instruction signal S from an operation start button in the host device 5 or the magnetic disk device.
When T is input to the control circuit 4, the magnetic disk medium 1 starts rotating, and the control circuit 4 initializes the magnetic head 2 and the control circuit 4 itself. If no abnormality signal is sent from the temperature gradient calculation circuit 8 to the control circuit 4, the control circuit 4 makes the magnetic disk device available to the host device 5 when the initialization operation is completed. A ready signal is used to notify that the state has been reached. If an abnormality signal indicating that the temperature gradient is abnormal is sent from the temperature gradient calculation circuit 8 to the control circuit 4, the control circuit 4
Even after the initialization operation is completed, it does not send a ready signal to the host device 5, and at the same time issues a command to the read/write circuit 3 to prohibit reading and writing of data on the magnetic disk medium 1.

したがって、環境温度が急激に変化した場合には、温度
勾配演算回路8より異常信号を制御回路4に送出するこ
とによって、磁気ディスク媒体1および磁気ヘッド2の
熱膨張により起こり得るデータの書き込みおよび読み出
し動作時の信頼性の劣化を未然に防止することができる
Therefore, when the environmental temperature changes rapidly, the temperature gradient calculation circuit 8 sends an abnormal signal to the control circuit 4, thereby preventing data writing and reading that may occur due to thermal expansion of the magnetic disk medium 1 and magnetic head 2. Deterioration of reliability during operation can be prevented.

〔発明の効果〕〔Effect of the invention〕

本発明は、以上説明したように、環境温度の急激な変化
を検出した場合には、磁気ディスク装置の書き込みおよ
び読み出し動作を禁止することにより、異常温度環境下
で装置が使用された場合の記録データの信頼性劣化を防
ぐことができる効果がある。
As explained above, the present invention prevents writing and reading operations of a magnetic disk device when a sudden change in environmental temperature is detected, thereby preventing recording when the device is used in an abnormal temperature environment. This has the effect of preventing data reliability from deteriorating.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明の一実施例を示すブロック構成図。 1・・・磁気ディスク媒体、2・・・磁気ヘッド、3・
・・リードライト回路、4・・・制御回路、5・・・上
位装置、6・・・温度検出器、7・・・変換器、8・・
・温度勾配演算回路。
The figure is a block diagram showing one embodiment of the present invention. 1... Magnetic disk medium, 2... Magnetic head, 3.
... Read/write circuit, 4... Control circuit, 5... Host device, 6... Temperature detector, 7... Converter, 8...
・Temperature gradient calculation circuit.

Claims (1)

【特許請求の範囲】[Claims] (1)上位装置に接続され、この上位装置からの制御信
号により磁気記録手段の駆動制御を行う制御回路を含む
磁気ディスク装置において、 磁気ディスク装置内にその温度勾配を検出し、検出され
る温度勾配が所定値以上である場合に、上記制御回路に
対して上記磁気記録手段の動作の禁止を指示する信号を
送出する手段を含む温度勾配検出手段を備えたことを特
徴とする磁気ディスク装置。
(1) In a magnetic disk device that is connected to a host device and includes a control circuit that controls the drive of magnetic recording means based on control signals from the host device, the temperature gradient within the magnetic disk device is detected and the detected temperature 1. A magnetic disk drive comprising: temperature gradient detection means including means for sending a signal to the control circuit to instruct prohibition of operation of the magnetic recording means when the gradient is greater than or equal to a predetermined value.
JP15110686A 1986-06-26 1986-06-26 Magnetic disk device Pending JPS637562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15110686A JPS637562A (en) 1986-06-26 1986-06-26 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15110686A JPS637562A (en) 1986-06-26 1986-06-26 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS637562A true JPS637562A (en) 1988-01-13

Family

ID=15511479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15110686A Pending JPS637562A (en) 1986-06-26 1986-06-26 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS637562A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6405277B1 (en) 1998-11-06 2002-06-11 International Business Machines Corporation Method and system for writing data to a magnetic storage device in a relatively cold or hot environment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6405277B1 (en) 1998-11-06 2002-06-11 International Business Machines Corporation Method and system for writing data to a magnetic storage device in a relatively cold or hot environment

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