JPH05101577A - Css mode magnetic disk driving device - Google Patents

Abstract

PURPOSE:To recognize that a CSS frequency reaches a prescribed CSS frequency prior to trouble caused during use of the magnetic disk driving device when the CSS frequency exceeds a guaranteed CSS frequency. CONSTITUTION:Whenever a magnetic disk 6 is driven, the previous CSS frequency value is read out by a CPU 8a from the magnetic disk 6 and is added with a constant value, and an added result is written to the magnetic disk 6. Then, at the time of an initial diagnosis, the CSS frequency value and the prescribed CSS frequency value are respectively read in by the CPU 8a from the disk 6 and a ROM 8b and are compared with each other, and when the CSS frequency value is more than the prescribed CSS frequency value, a host device is informed of this by setting an alarm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CSS type magnetic disk drive.

[0002]

2. Description of the Related Art In a battery-powered system found in recent notebook computers, a built-in magnetic disk drive is contact-started to prevent battery consumption.
Using a method called stop (hereinafter referred to as CSS),
When there is no access to the magnetic disk drive, the motor of the magnetic disk drive is stopped.

In the CSS system, an area called a landing shopping zone is provided on the magnetic disk surface, and the magnetic head is kept in contact with the disk surface in this area while the motor is stopped. Then, the motor is driven, the disk surface is slid with respect to the magnetic head, the number of rotations of the disk reaches a certain number of rotations, and the magnetic head is levitated by the lift due to the air flow between the magnetic head and the read / lead. Move to write operation.

Therefore, in a battery-powered system incorporating a magnetic disk drive device using the CSS system, C is applied to the landing shopping zone in the magnetic disk drive device during power-on / off of the system.
The SS operation is performed many times, and the magnetic head repeatedly slides on the disk surface of the landing shopping zone each time.

Therefore, although the number of times of guarantee of CSS within the service life of the magnetic disk drive is being improved, a sufficient technique has not been obtained yet.

[0006]

In the conventional CSS type magnetic disk drive, system power-on / power-on /
Since the CSS operation is performed many times while it is off, the CSS operation is performed within the period less than the useful life of the magnetic disk drive.
The number of times exceeds the CSS guaranteed number of times, and there is a possibility that a failure occurs during use and the stored information cannot be read.

According to the present invention, the number of CSSs exceeds the number of guaranteed CSSs, and the number of CSSs reaches the specified number of CSSs set based on the guaranteed number of CSSs before a failure occurs during use of the magnetic disk drive. CSS you can know
It is an object of the present invention to provide a method magnetic disk drive device.

[0008]

In order to achieve the above object, in the CSS type magnetic disk drive device of the present invention, the CSS number storage means and, every time the magnetic disk is driven, the CSS number storage means stores the previous number. A CSS count-up means for reading the CSS count value, adding a constant value, and writing the addition result to the CSS count storage means; and a CSS specified count storage means for storing the CSS specified count value set based on the CSS guaranteed count. The contents of the CSS number storage means at initial diagnosis and the CSS prescribed number storage means are compared,
When the S count value exceeds the CSS specified count value, a CSS count check means for setting an alarm is provided.

[0009]

When the magnetic disk of the CSS type magnetic disk drive having the above-mentioned structure is driven, the CSS number count-up means reads the previous CS from the CSS number storage means.
S value is read, constant value is added, and the addition result is CS
The S number of times is stored in the storage means. The CSS frequency check means compares the contents of the CSS frequency storage means and the CSS prescribed frequency storage means at the time of initial diagnosis, and sets an alarm when the CSS frequency value exceeds the CSS prescribed frequency value.

Therefore, according to the present invention, the CSS count is C
It is possible to know that the number of CSSs has reached the specified number of CSSs before exceeding the guaranteed number of SSs and causing a failure during use of the magnetic disk drive.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The elements common to the drawings are given the same reference numerals.

FIG. 1 is a block diagram of a CSS type magnetic disk drive according to the present invention. interface·
The controller 1 exchanges data with the host, decodes and executes commands, transfers data, and controls. The data separator 2 converts (encodes) the write NRZ data sent from the interface controller 1 into data such as a 2-7 RLL code, and restores the read data from the pulse detector 3 into NRZ data.

The pulse detector 3 converts the analog waveform read from the magnetic head 5 and amplified by the first-stage amplifier 4 into a pulse-shaped signal. Further, in order to detect the servo signal for head positioning included in the read signal, the servo timing generation circuit 10 and the servo
The signal is also sent to the pattern detection circuit 11.

The first-stage amplifier 4 is also known as Read / Write.
Also called an amplifier, write data is converted into a current and supplied to the magnetic head 5. Further, at the time of reading, the read analog signal is amplified and sent to the pulse detector 3.

The magnetic head 5 converts the pulse train of the write signal into a magnetic signal, records it on the magnetic film on the surface of the magnetic disk 6, and converts the data on the magnetic disk 6 into an electric signal at the time of reading. It is sent to the amplifier 4.

The magnetic disk 6 has a disk formed of a substrate mainly made of aluminum, and a magnetic material is applied to the surface of the disk to form a film which is plated or vapor-deposited. A signal is recorded on the magnetic disk 6 by magnetizing the magnetic film.

The buffer memory 7 is an IC memory (SRAM) for temporarily storing the data sent from the host and the data read from the magnetic disk 6.

The interface control controller 8 has a central processing unit (hereinafter referred to as CPU) 8a and a read only memory (hereinafter referred to as ROM) 8b, and issues an operation command to the interface controller 1 and Control signals are exchanged with the mechanical control CPU 9.

The mechanical control CPU 9 is a CPU for controlling the rotation command of the spindle motor 12, controlling the voice coil motor (hereinafter referred to as VCM), and controlling the mechanism of the magnetic disk device.

The servo timing generation circuit 10 is a circuit for generating a timing for reading servo data for positioning the magnetic head 5 embedded between sectors of a track from a pulse train of a signal read from the magnetic disk 6.

The servo pattern detection circuit 11 detects a servo pattern for positioning the magnetic head 5 from the read analog signal, and sends it to the mechanical control CPU 9.

The spindle motor drive circuit 12 drives the spindle motor based on a command from the mechanical control CPU 9.
The motor 13 is turned on / off to keep the spindle motor 13 rotating at a constant speed.

The spindle motor 13 holds the magnetic disk 6 fixed to its shaft and drives it to rotate.

The D / A converter 14 converts the digital signal output from the mechanical control CPU 9 into an analog voltage and sends it to the VCM drive circuit 15.

The VCM drive circuit 15 is the D / A converter 1
Based on the analog voltage value from 4, the current is passed through the coil of the VCM 16 that moves the actuator 17 to which the magnetic head 5 is attached. Further, the value of the flowing current is detected, and feedback is applied to the mechanical control CPU 9 so as to keep the current appropriate.

The VCM 16 has a flowing current direction, and
The actuator 17 is driven according to the strength, and the magnetic head 5
Is moved to an arbitrary track on the magnetic disk 6 and positioned on the track.

The actuator 17 moves the magnetic head 5 on the magnetic disk 6 according to the driving force of the VCM 16.

The lock solenoid 18 fixes the magnetic head 5 so that it does not move when the VCM 15 is not driven (when the magnetic disk drive is not operating), and locks (fixes) the actuator 17 when no current is applied to the coil. , V
When the CM 15 is driven, a current is passed through the coil to release the lock.

The lock solenoid drive circuit 19 is a drive circuit for supplying a current to the lock solenoid 18.

FIG. 2 is a basic block diagram of the present invention. The CSS count-up means 20 reads the previous CSS count value from the CSS count storage means 21 every time the disk is driven, adds a constant value, and writes the addition result to the CSS count storage means 21. CSS number checking means 2
The reference numeral 2 comprises a comparison means 23 and an alarm setting means 24. At the time of initial diagnosis, the comparison unit 23 uses the CSS number storage unit 2
1 and the contents of the CSS prescribed number storage means 25 are compared, and C
When the SS count value is equal to or greater than the CSS specified count value, the alarm setting means 24 is caused to set an alarm.

In this embodiment, the magnetic disk 6 is used as the CSS number storage means 21, and the ROM 8b is used as the CSS prescribed number storage means 25. Further, the CSS number counting up means 20, the comparing means 23, and the alarm setting means 24
Is executed by the CPU 8a based on the steps of the control program stored in the ROM 8b.

Next, the operation will be described with reference to FIGS.

FIG. 3 is a flowchart for counting up the number of CSS times which is always performed when the spindle motor is started. The spindle motor 13 is started when the power is turned on or when there is no access from the host for a certain period of time.
This is performed when shifting from the standby mode in which the spindle motor 13 is temporarily stopped to the operating state. In step S11, the CPU 8a activates the spindle motor 13. When the spindle motor 13 is normally started up, the prescribed steady rotation is reached, and the data from the disk 6 can be read / written, the magnetic head 5 is moved to the system track in step S2. This system track is a track provided for recording internal data of this apparatus, which is provided in addition to the track accessible by the host. An area for recording the “CSS count value N” is secured in this system track. In step S13, the value of this "CSS number counter" is read. In step S14, the value of "CSS count value N" is incremented by (+1). Step S1
In step 5, the contents of “CSS count value N” are written again on the disk 6. Each time this flowchart is executed, the value of "CSS count value N" on the disc is incremented by (+1).

Since the initial value of the CSS frequency value N is set to "0" immediately after the manufacturing of the apparatus, the "CSS frequency value N" indicates the number of times the magnetic disk drive apparatus has been subjected to CSS. It will be.

FIG. 4 is a flow chart for checking the number of CSS times which is performed in association with the initial diagnosis when the power is turned on.

In step S1, the CPU 8a checks the functions of circuit elements such as a memory and a register, mechanical disks such as a spindle motor and a VCM, a head and the like in an initial diagnosis when the power is turned on. If this check shows no abnormality, a status bit indicating normal is set, and if an abnormality is detected, an alarm bit (error
Bit) is set. Next, in step S2, the CPU 8
a moves the magnetic head 5 to the system track and reads the CSS number value N on the system track in step S3.

The read CSS count value N is determined in step S
4 is compared with the CSS specified number of times value A set based on the CSS guaranteed number of times value and is equal to the CSS specified number of times value A,
If it is larger, the CSS frequency alarm is set in step S5. It is not set when the CSS count value N is smaller than the CSS specified count value N.

When the CSS frequency alarm is set in this way, it is reported to the host together with the self-diagnosis result.
Thus, the host is the CSS of this magnetic disk drive.
You can know that the number of times is approaching the guaranteed number.

The specified CSS number of times is set to be lower than the guaranteed CSS number of times even when the CSS number of times exceeds while the magnetic disk drive is in use.

In the present embodiment, 1 is used as a constant for counting up the number of CSS times, but it may be other than 1.

[0041]

Since the present invention is configured as described above, it has the following effects. By providing the CSS number counting up means and the CSS number checking means, before the CSS number exceeds the CSS guaranteed number and a failure occurs during use of the magnetic disk drive,
It is possible to know that the CSS count has reached the CSS specified count.

[Brief description of drawings]

FIG. 1 is a block diagram of a magnetic disk drive device according to the present invention.

FIG. 2 is a basic configuration block diagram of the present invention.

FIG. 3 is a flowchart for counting up CSS times.

FIG. 4 is a flowchart for checking the number of times of CSS.

[Explanation of symbols]

 20 CSS Number Count Up Means 21 CSS Number Storage Means 22 CSS Number Check Means 23 Comparison Means 24 Alarm Setting Means 25 CSS Prescribed Number Means Storage Means

Claims (1)

[Claims] 1. A CSS number storage means and a CSS number count each time a magnetic disk is driven, a previous CSS number value is read from the CSS number storage means, a constant value is added, and the addition result is written to the CSS number storage means. Up means, CSS specified number storage means for storing the CSS specified number value set based on the CSS guaranteed number of times, and the content of the CSS number of times storage means and the CSS specified number of times storage means at the time of initial diagnosis, and the CSS number of times value is compared. When the number of times exceeds the CSS specified number of times, a CSS type magnetic disk drive device is provided with a CSS number checking means for setting an alarm.