JPH01134771A - Fixed magnetic disk device - Google Patents

Abstract

PURPOSE:To speedily retreat a magnetic head to the area of a cylinder for shipping by providing plural cylinder areas for shipping to be diffused with a magnetic disk and preparing a seeking instruction when the power source of a power device is off by means of the computer of a computer system. CONSTITUTION:Cylinder areas 20, 40 and 60 of a magnetic disk 5 are made to be diffused at plural points, and when a power source 6 is off, the magnetic head is moved from a present position to the nearest cylinder areas 20, 40 and 60 for shipping in a short time. When the power source 6 is off, a power source 6 off signal is given to a CPU 1 as an interrupting signal, a shipping processing is executed, and the magnetic head is automatically retreated. Namely, since the plural cylinder areas for shipping are located to be diffused on the magnetic disk, the magnetic head is not always necessary to be retreated to the same cylinder area, and it is sufficient that the head is retreated to the nearest cylinder for shipping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixed magnetic disk drive, and particularly to an operation of retracting a magnetic head to a shipping cylinder portion when power is cut off.

[Conventional technology]

FIG. 6 is a schematic configuration diagram of a computer system equipped with a fixed magnetic disk, and 1 is a computer (CPU)
), 2 is a ROM, 3 is a RAM, 4 is an interface for a fixed magnetic disk device, 5 is a Winchiesta type fixed magnetic disk device, 6 is a power supply device, 7 is an interface with a CRT console, 8 is a CRT console, and 9 is an interface for a CRT console. The external device interface IO is a seek command to the shipping cylinder.

FIG. 7 is an exploded view of the magnetic disk in the conventional fixed magnetic disk drive, in which the vertical direction shows cylinders and the horizontal direction shows sectors, and the hatched cylinders are shipping cylinder areas.

Fixed magnetic disk device5. In this case, when the power supply device 6 is powered on, the magnetic disk rotates with a small gap between it and the magnetic head, but when the power supply device 6 is powered off, the rotation of the magnetic disk stops. Since the magnetic head comes into close contact with the magnetic disk, in order to prevent damage to the magnetic part of the disk where the magnetic head is in close contact, the operator must turn off the CR before turning off the power supply 6.
Operate the T console 8, enter a specific command, move the magnetic head to the shipping cylinder shown in Figure 7,
After that, it is common to turn off the power supply device 6.

[Problem that the invention seeks to solve]

In a conventional fixed magnetic disk drive, the shipping cylinders are provided in one place at one end of the magnetic disk, so if the magnetic head is in the position of cylinder number O when the power supply 6 is turned off. etc., it is necessary to keep the output of the power supply device 6 on for several hundred m5 or more, so a special one is used as the power supply device 6, which is not only expensive, but also every time the power supply device 6 is turned off. The operator had to operate the CRT console 8 and input specific commands, which was troublesome.

This invention was made to solve the above problem.
It is an object of the present invention to provide a fixed magnetic disk device that allows a magnetic head to be retracted to a shipping cylinder area more quickly than in the past, and that does not require the use of a special power supply device 6. shall be.

[Means for solving problems]

In order to achieve the above object, the present invention has a configuration in which a magnetic disk has a plurality of shipping cylinder areas dispersedly, and a computer of a computer system creates the above seek command when the power supply is turned off.

[Effect]

In this invention, since the plurality of shipping cylinder areas are located scattered on the magnetic disk, the magnetic head does not always need to be retracted to the same cylinder area, but can be retracted to the nearest shipping cylinder area. If possible, this search for the nearest shipping cylinder area can be performed by computer software by storing a cylinder number table of shipping cylinder areas.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, when the power supply device 6 is powered off, it sends out an off signal, and this off signal is given to the CPUI as an interrupt signal. As shown in FIG. 2, the magnetic disks of the fixed magnetic disk device 5 have cylinder numbers 20, 40, 6.
The 0 part is the shipping cylinder area,
The cylinder numbers of this cylinder area are stored in the ROM 2 in the form of a table as shown in FIG. Also, R
AM3 stores the cylinder number of the cylinder in which the magnetic head currently exists in the data area, as shown in FIG.

In this configuration, the CPU 1 uses a fixed magnetic disk 5
When accessing, first, the relevant cylinder number and sector number are calculated logically, and then the logical cylinder number is converted to a physical cylinder number. At that time, the shipping cylinder number table shown in Figure 3 is See.

In this example, shipping cylinders are taken at intervals of 20 cylinders, so the physical cylinder numbers are 0.1.2,
...18.19.21.22, ...38.39.4
The sequence is 1.42... Conversion from logical cylinders to physical cylinders is easily performed using a certain conversion formula.

After the physical cylinder is calculated, a seek command is sent to the fixed magnetic disk device 5 via the interface 4, but at this time, the data area in the RAM 3 that records the current position of the magnetic head shown in FIG. 4 is also updated. Ru.

When the CPUI receives the power-off interrupt signal, it checks whether the fixed magnetic disk device 5 is in process of processing, as shown in FIG. 5, and if it is in process, it waits until the process is finished. When the fixed magnetic disk device 5 is ready to accept a new command, the CPU reads the physical cylinder number in which the magnetic head currently exists from the RAM 3, and selects the shipping cylinder area closest to the position of the cylinder number. The cylinder number is searched from the table in the ROM 2, and a seek command to the cylinder area of this cylinder number is sent to the fixed magnetic disk device 5.

In this way, in this embodiment, the shipping cylinder areas for magnetic disks are scattered at multiple locations, so when the power is turned off, the magnetic head can be moved from the current position to the shipping cylinder area in a shorter time than in the past. It can be moved with.

Also, when the power is turned off, a power off signal is given to the CPU 1 as an interrupt signal to cause the shipping process to be executed.
The magnetic head can be automatically retracted, reducing the operator's effort compared to the conventional method.

Note that there is a limit to how long the power can be maintained when the power supply unit 6 is turned off, so when using a normal magnetic disk, the design is designed to minimize the time required to process - times the command, and the seek operation is also limited to - times. Instead of moving it randomly, try to repeatedly seek for several cylinders.

〔Effect of the invention〕

As explained above, in this invention, since the shipping cylinder areas are provided at multiple locations on the magnetic disk, there is no need to use a special power supply, and the CPU system can be configured according to the capacity of the normally used power supply. Therefore, the CPU system can be made cheaper than the conventional one. Moreover, since the CPU automatically creates a seek command when the power is turned off, the operator's effort can be saved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a developed view of a magnetic disk in the above embodiment, FIG. 3 is a diagram showing a shipping cylinder number table in the above embodiment, and FIG. 4 is a diagram showing the above embodiment. FIG. 5 is a flow chart of the CPU program in the above embodiment; FIG. 6 is a block diagram showing a computer system equipped with a conventional fixed magnetic desk; FIG. The figure is a developed view of the fixed magnetic disk in the conventional example. In the figure, 1--CPU, 5--Magnetic disk device,
6...Power supply device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a fixed magnetic disk device that moves a magnetic head to a shipping cylinder of a magnetic disk in response to a seek command, the magnetic disk has a plurality of scattered shipping cylinder areas, and a computer of a computer system is connected to a power source. A fixed magnetic disk device, characterized in that the seek command is created when the power of the fixed magnetic disk device is turned off. (2) In response to the power-off interrupt signal, the computer system checks the current cylinder number of the magnetic head recorded in the RAM with the cylinder number table in the shipping cylinder area stored in the ROM, and compares the current cylinder number with the cylinder number table in the shipping cylinder area stored in the ROM. The fixed magnetic disk device according to claim 1, wherein a seek command to an upper cylinder number position is created.