JPS6194284A - Magnetic head control system for external auxiliary memory - Google Patents

Abstract

PURPOSE:To shift assuredly a magnetic head to a shipping zone by using a program stored in a ROM to shift the head to the shipping zone independently of a normal system program. CONSTITUTION:In an application mode of a power supply, etc., a program reading command of a ROM4 can be supplied from a key switch of a head shipping zone. In other words, a head shift command is read onto a bus line from the ROM4 to shift a magnetic head 8 to a shipping zone 6c in case an HDD2 connected as an external auxiliary memory is unable to work with a system program given from a program memory RAMa or a disk control part HDC. Then said head shift command is supplied to the HDD2 as a command which is independent of a drive command based on the system program. Then the head 8 which is positioned at the most outer circumference in a power supply application mode is forcibly shifted to the zone 6c.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head control method for an external auxiliary storage device, which is convenient for protecting the magnetic head of an external auxiliary storage device such as a magnetic storage device.

(Prior Art) In a magnetic storage device using a magnetic disk, usually called a hard disk, a program is stored in its disk control unit when the power is turned on, and as the arithmetic processing program progresses, the head and second drives on the disk are driven. , necessary data, etc. are read or written. As is well known, a magnetic head moves over a disk while being supported by an arm and maintaining a small gap from the surface. These hard disks and their magnetic heads are extremely susceptible to shock, and traditionally a shipping zone is formed as a non-recording area inside the innermost recording area of the magnetic disk, and the magnetic head is moved to this shipping zone. I was trying to carry the device around after I let it go.

In other words, the shipping zone is an area on the disk where data is neither read nor written, and even if a magnetic head touches this shipping zone and damages it, the data on the magnetic disk will not be affected. That's because there isn't.

(Problems to be Solved by the Invention) In such a conventional external auxiliary storage device, the operation program for moving the magnetic head to the shipping zone is included in the system program stored in the disk control unit. If a problem occurs in normal cart rotation mode, the operator switches the device to manual mode, selects and executes an operation program to move the magnetic head to the shipping zone. However, many of the reasons why a hard disk does not work properly are because the program data is not loaded into the disk control unit correctly, or when the data cannot be read correctly even if loading is performed correctly.
The aforementioned operating program included in the system program also had the disadvantage of not being able to function. However,
In fact, when this type of software failure or data input/output mechanism failure occurs, it becomes necessary to use the shipping zone to protect the magnetic head while transporting the device.

The present invention has been made to eliminate these drawbacks, and even when the magnetic head cannot be controlled by drive commands based on a system program, the magnetic head can be reliably moved to the shipping zone and the magnetic disk can be protected. It is an object of the present invention to provide a magnetic head driving method for an external auxiliary storage device that makes it possible to perform the following steps.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a shipping zone formed inside the innermost recording area of a magnetic disk;
It is equipped with a read-only memory (ROM) that stores a program for driving the magnetic head to this shipping zone, and an operation switch that inputs a program read command to this ROM. The magnetic head is moved to the shipping zone by the operation switch independently of the command.

(Function) In other words, when the magnetic storage device does not operate normally based on the system program, the drive command in the system program is normally generated by switching to the manual mode operation state, causing the m% head to move to the disk. However, if such a drive command cannot be generated, for example, by turning off the power and then turning on the power while turning on a special operation switch, the read-only memory (hereinafter referred to as A program stored in a ROM (ROM) is called and the magnetic head is driven to the shipping zone.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block configuration diagram of an arithmetic processing system equipped with a hard disk device HDD as an external auxiliary storage device, and FIGS. 2 and 3 are plan views of a hard disk main body and diagrams showing an example of the hard disk device HDD.

1 is an arithmetic processing circuit MPU, which is connected via a path line 3 to storage devices such as a program memory RAM a and a data memory RAM b, and is also connected to an HDD 2 . The HDD 2 exchanges data and programs with the path line 3 via the disk control unit HDC.
is a ROM that stores a program for driving the magnetic head of the HDD-2 to the shipping zone of the magnetic disk.
It is. A keyboard KEY 5 includes an operation switch for inputting a program read command to the ROM 4, and is designed to generate various key human input signals on the pass line 3 via the digital input section D/I.

The HDD 2 includes a plurality of disk-shaped magnetic disks (hard disks) 6 as shown in FIG. As the shaft 7a inserted into the central support hole 6a is rotated by the drive unit 7,
An arm 9a supporting the magnetic helad 8 is linearly driven on the resolution wheel by the track selection mechanism 9. The surface of the disk 6 has a recording area 6b formed with a plurality of concentric tracks and a shipping zone 6C inside the innermost recording area.
It is divided into.

As mentioned above, the shipping zone 6C is a non-recording area that is not used for recording data, etc., and when the HDD 2 is separated from the arithmetic processing system and transported, the magnetic heald 8 is placed at the position 8' shown in FIG. Clamped, recording area 6
I'm trying not to hurt b. In addition, during normal use,
When the power is turned on, the magnetic head 8 is positioned at the outermost track of the disk 6, and then a desired track is selected by a command read from the system program, or the head 8 is moved by switching KEY 5 from AUTO to MANUAL. A drive command to move to zone 6C can also be given to HDD 2.

The gist of the present invention is that, as shown in the operation flowchart of FIG. 4, when the power is turned on, etc.

The main feature is that the command to read the program of the ROM 4 can be input from the key switch of the head shipping zone (H3Z). That is, in the arithmetic processing system of FIG. 1, the HDD 2 connected as an external auxiliary storage device is
Program memory RAMa or disk control unit ID
If the system cannot operate depending on the system program from C, move the rad 8 from ROM 4 to the magnetic shipping zone 6.
A head movement command for driving up to c is read onto the pass line 3, and inputted to the HDD 2 as a command independent of the drive command based on the system program, forcing the magnetic head 8 to be positioned to the outermost track when the power is turned on. It is then moved to the shipping zone 6C.

A command for moving the head 8 is generated as a pulse signal by the disk control unit HDC, for example, and is sent to the HDD 2.
The pulse motor that operates the track selection mechanism 9 is driven, but when the H3Z key switch is turned on, the head drive means is newly connected to the pass line through a separate signal line, and the commands in the ROM 4 are executed. When the magnetic head 8 completes the movement to the shipping zone 6C, a predetermined movement completion signal is output, and the operator can disconnect the HDD 2 from the system and transport it to repair the failure. .

In the above embodiment, the command to read the program from the ROM 4 is issued by operating the H5Z key switch when the power is turned on. However, it goes without saying that the timing of activation using the H5Z key switch is not limited to when the power is turned on. In addition, when simply transporting a normal HDD 2 that is not broken, it is sufficient to give a drive command based on the system program before disconnecting it from the system, and by operating the H3Z key switch in manual mode, the head can be transferred directly. moved to the zone.

(Effects of the Invention) As described above, the present invention moves the magnetic head to the shipping zone independently of the normal system program using the program stored in the ROM, so the magnetic head can be moved reliably. It is possible to provide a magnetic head control method for an external auxiliary storage device that can move to a shipping zone and protect the recording surface of a magnetic disk.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a plan view showing a magnetic disk, FIG. 3 is a block diagram showing an example of a magnetic storage device, and FIG. 4 is a block diagram showing an example of a magnetic storage device. It is a flowchart explaining the operation of the same embodiment. 2...Hard disk device (HDD), 3...Pass line, 4...Read-only memory (ROM), 5...
...Keyboard (KEY), 6...Magnetic disk, 8
...magnetic head. Patent Applicant Fanuc Co., Ltd. Representative Patent Attorney Minoru Tsuji Figure 1 Figure 3 Dingzokuke 3 舊 - [Zan (0 shots) 1. Incident A Displayed in 1982 Patent Application No. 215968 2. Name of the invention outside Magnetic head control method for auxiliary storage device 3, relationship with the case of the person making the amendment Patent applicant address: 3580 Koumabo, Oshino-mura, Oshino-mura, MinamisN-gun, Yamanashi Prefecture Name: Fanuc Corporation 4, Agent 6, Subject of amendment: Details Column 7 of Item 1 of Detailed Description of the Invention, Contents of Amendment/

Claims (1)

[Claims] A shipping zone formed inside the innermost recording area of the magnetic disk, a read-only memory (ROM) that stores a program for driving the magnetic head to this shipping zone, and a program read command is input to this ROM. an operation switch, and the magnetic head is moved to a shipping zone by the operation switch independently of a drive command supplied to the magnetic head from a system program. Head control method.