JPH03165366A - magnetic disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic disk device.

[Prior Art] Conventional magnetic disk devices continue to waste power even when a host device is not reading from or writing to a magnetic disk. Moreover, the maximum amount of power was always used at that time, and no control was taken to control power consumption.

[Problems to be Solved by the Invention] However, such a conventional magnetic disk device consumes too much power and is difficult to be installed in a battery-powered portable computer or the like.

In addition, conventional magnetic disk devices generate a large amount of heat, which has a large effect on the installed equipment and the deterioration of the magnetic disk device itself over time, leading to a decline in reliability.

The present invention is intended to solve these problems, and its purpose is to improve the logic of the signal line for selecting a magnetic disk device by a host device, and when reading or writing from or not to a magnetic disk. An object of the present invention is to provide a magnetic disk device that controls power consumption by using the following methods.

[Means for Solving the Problems] As shown in the functional block diagram of FIG. 1, the magnetic disk device of the present invention includes a spindle motor drive circuit 9 that drives a spindle motor 2 to which a magnetic disk 1 for storing data is attached. , an arm drive circuit 5 for moving an arm 4 to which a magnetic head 3 is attached for reading and writing data to the magnetic disk 1 in the radial direction of the magnetic disk 1; and a data drive circuit for reading and writing data to the magnetic disk 1. In a magnetic disk device equipped with a read/write circuit 6, the power consumption of the spindle motor drive circuit 9, the arm drive circuit 5, and the data read/write circuit 6 is reduced to a predetermined power when the data is not being read or written. Means A increases the power consumption of the hand GB that rotationally drives the spindle motor drive circuit 9 and the arm drive circuit 5 when the signal line 8 for selecting the magnetic disk device from the host device t7 becomes active. It consists of means C and means for increasing the power consumption of the data read/write circuit 6.

[Operation] When data is not being read or written to the magnetic disk l, the power consumption of the spindle motor drive circuit 9, data read/write circuit 6, and arm drive circuit 5 is reduced by the means A for reducing the power consumption to a predetermined power consumption. When the host device 7 activates the magnetic disk device selection signal line 8 and attempts to read or write to the magnetic disk 1,
means B for rotationally driving the spindle motor drive circuit 9;
Power consumption is controlled by increasing power by means C for increasing the power consumption of the arm drive circuit 5 and means for increasing the power consumption for the data read circuit 6.

[Embodiment] FIG. 2 is a sectional view of an embodiment of the present invention, in which reference numeral 1 denotes a magnetic disk attached to a spindle motor 2. As shown in FIG. On each side of the magnetic disk 1 is a magnetic head 3 attached to an arm 4. All these parts are housed in a case 10. Also case lO
A spindle motor drive circuit 9, an arm drive circuit 5, and a control device 11, which will be described later, are connected to each other and arranged on the lower surface of the motor. The control device 11 is connected to the host device RA7 by a magnetic disk control line including a magnetic disk device selection signal line 8.

What is the magnetic disk control line mentioned here? 5C3
It refers to the I-bus, and it refers to the Small Compute bus.
It is an abbreviation for r System Interface and is called Scashi. As the name suggests, this interface was designed for small computer systems, and its main use is as an interface between the computer itself and an external storage device, and the one that is currently standardized is a magnetic disk device like the one of the present invention. , optical disk devices, magnetic tape devices, and printers. Regarding magnetic disk devices, the American ANSI
a National 5 standard I
n5 titute) is ANSI X3゜131-19
It has been established as 86. The magnetic disk device of the present invention complies with this standard.

To explain the 5C3I bus configuration, the 5C3I bus has eight data lines, one data parity line, and nine control lines. If we classify the nine control lines, R is used as a timing control signal for data transfer.
There are two signals, EQ and ACK, and four signals, MSG, SEL, C/D, and Ilo, that determine how the data bus is used.
It consists of three other signals: BSY, ATN, and RST. These control lines and data lines create a phase that indicates the status on the bus, and the phase that is relevant to the present invention is the selection phase/reselection phase in which the host device 7 selects the magnetic disk device it wants to use. The SEL signal at that time corresponds to the magnetic disk device selection signal line 8.

FIG. 3 shows an example of the aforementioned control device 11, and reference numeral 15 in the figure indicates the CPU 12. RAM13, ROM1
A microcomputer consisting of 4, etc., receives the SEL signal (magnetic disk device selection signal line 8) of the 5CSI bus connecting the host device 7 and the control device 11, and controls the power switch 17 of the spindle motor drive circuit 9 and the data read/write circuit 6. The power control signal for adjusting the power consumption of the power switch 16 and the arm drive circuit 5 is output, and the supplied power is adjusted by turning these signals ON and OFF.

Next, the operation of the apparatus configured as described above will be explained based on the flowchart shown in FIG.

When power is supplied to the aforementioned control device 1111, power consumption control is started according to the power consumption control program stored in the ROM 14 of the microcomputer 15.

First, the CPU 12 turns on the power switch 17, activates the spindle motor drive circuit 9, and rotates the spindle motor 2 (step 20).

When the rotation of the spindle motor 2 becomes stable, the power switch 16 of the data read/write circuit 6 is turned on, and the arm drive circuit 5 is set to a predetermined power Y. Increase the power consumption by 1″ (step 21.22.23).

The CPU 12 is a host device]! 7 is reading from and writing to the magnetic disk 1, and if it is reading and writing, it stands by with the same power consumption, and if it is not reading and writing, it changes the predetermined power of the arm drive circuit 5 to X (predetermined power consumption). (relationship: .27).

Next, the CPU 12 uses the 5C9I to determine whether the host device 7 has selected its own magnetic disk device.
bus SEL signal (magnetic disk device selection signal line 8
), and if it is not selected, it continues to monitor that line, and if it is selected, it starts again from step 20 and increases the power consumption (step 28).

Moreover, FIG. 5 is a diagram in which the flowchart in FIG. 4 is replaced with a timing chart, and shows the electrical flow. Figure 6 shows the total power consumption of the magnetic disk device (total power consumption
(a<b), and shows the relationship between the total power consumption in the above-described flowchart.

In this way, the power consumption of the spindle motor drive circuit 9, the data read/write circuit 6, and the arm drive circuit 5 is increased/decreased until the power supply to the control device 11 is stopped, thereby continuing to control the power consumption vi.

[Effects of the Invention] As described above, according to the present invention, the power consumption is reduced when the host device is reading and writing to the magnetic disk and when it is not, and in the logic of the signal line for selecting the magnetic disk device. By controlling the power by increasing and decreasing it intermittently, it is possible to reduce the power consumption of the entire magnetic disk drive, making it possible to install it in a battery-powered computer and reducing the heat generated from the magnetic disk drive. Therefore, reliability of the entire magnetic disk device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for clearly showing the configuration of a magnetic disk device of the present invention. FIG. 2 is a sectional view showing an embodiment of the magnetic disk device of the present invention. FIG. 3 is a block diagram showing an embodiment of the control device in the magnetic disk device of the present invention. FIG. 4 is a flowchart showing the operation of the magnetic disk device of the present invention. FIG. 5 is an explanatory diagram showing a flowchart showing the operation of the magnetic disk device of the present invention in the form of a timing chart. FIG. 6 is an explanatory diagram showing the total power consumption of the magnetic disk device of the present invention. C. Decreasing the power to a predetermined level when not reading or writing to the magnetic disk. Control means. Means for rotationally driving the spindle motor drive circuit. Means for increasing the power consumption of the arm drive circuit. Means for increasing the power consumption of the data read/write circuit. - Magnetic disk - Spindle motor - Magnetic head - Arm - Arm drive circuit - Data read/write circuit - Host device - 5C3I bus SEL signal (magnetic disk device selection signal line) - Spindle motor drive circuit - Case - Control device - CPU - RAM ・ROM ・Microcomputer ・Spindle motor drive circuit power switch ・Data read/write circuit power switch and above

Claims (1)

[Claims] A spindle motor drive circuit that drives a spindle motor to which a magnetic disk for storing data is attached, and an arm to which a magnetic head for reading and writing data to the magnetic disk is attached is moved in the radial direction of the magnetic disk. and a data read/write circuit for reading and writing data to and from the magnetic disk, the spindle motor drive circuit and the arm drive circuit comprising: a data read/write circuit for reading and writing data to and from the magnetic disk; and means for reducing power consumption of the data read/write circuit to a predetermined power; means for rotationally driving the spindle motor drive circuit when a signal line for selecting the magnetic disk device from a host device becomes active; A magnetic disk device comprising: means for increasing power consumption of an arm drive circuit; and means for increasing power consumption of the data read/write circuit.