JPH0476858A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent waste time by executing a prescribed processing within settling time set in advance after stopping a magnetic head when a deciding means decides that the magnetic head arrives at an objective cylinder. CONSTITUTION:A CPU 12 drives a spindle motor 4 through a spindle motor control line 13 so as to rotationally drive magnetic disks 1-3, and an actuator 5 is driven through a head seek control line 14 so as to seek a data head to the objective cylinder as the object of reading. Based on servo information read out of a servo surface by a servo head 11 to be supplied through a servo head signal line 16, a CPU 12 executes positioning to the target cylinder. Next, when it is decided that the head arrives at the target cylinder, the CPU 12 stops the seek operation of the head and executes the preparation processing of read control to be next executed. When the processing is completed and it is shorter than settling time 3msec, the CPU 12 executes remaining settling so that the total time of processing time and settling time can be 3msec. Thus, the processing time can be shortened.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a magnetic disk device used as an external storage means of a computer, and particularly relates to a magnetic disk device used as an external storage means of a computer.
The present invention relates to a magnetic tisf device that is suitable for eliminating wasted time and achieving faster processing by executing the processing that follows the control first.

[Conventional technology]

In conventional magnetic tisf devices, after the magnetic head is moved to the target cylinder, a timer or the like is used to measure the magnetic head vibration waiting time (settling time) until the vibration of the magnetic head subsides. We have adopted a method of waiting for the situation to subside. For example, as shown in FIG. 5, in conventional seek control, after the magnetic head is moved to the seek target cylinder position based on the position signal (step 5AI), it is not determined whether the magnetic head has reached the target cylinder or not. 5A2), when the magnetic head is reached, the magnetic head is stopped and a time of about 3 m5ec is set as a settling time for suppressing the vibration of the magnetic head (step 5A3). The seek control is then terminated when the vibration of the magnetic head subsides.

[Problem to be solved by the invention]

By the way, the above-mentioned conventional magnetic disk device has the following problems. After the seek operation of the magnetic head is completed, the waiting time for magnetic vibration, which is set to several milliseconds, is simply waiting for time to elapse. No processing was performed, resulting in wasted time. Therefore, there was a problem in terms of processing speed in the magnetic disk device. The present invention solves the above-mentioned problems, and provides a magnetic disk device that eliminates wasted time and achieves faster processing by first executing the process following the 7-return control within the settling time. With the goal.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a magnetic head, a magnetic disk on which information is written or read by the magnetic head, and a drive means for moving the magnetic head in the radial direction of the magnetic disk. In a magnetic disk drive, a determining means determines whether the magnetic field moved by the driving means has reached the target position, and the determining means determines that the magnetic field has reached the target position. In this case, the magnetic head is characterized by comprising a control means for performing a predetermined process within a preset settling time after stopping the magnetic head.

[Effect]

According to the present invention, since a predetermined process is executed prior to the next 7-way operation of the magnetic head within the settling time, wasted time can be eliminated and processing speed can be increased compared to the conventional method. .

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk device according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the magnetic disk device of this embodiment is equipped with a magnetic disk 1.2.3, which is rotated by a spindle motor 4. As shown in FIG. in this case,
A servo surface 3A on which servo information is recorded is provided on the back surface of the magnetic disk 3. In addition, data heads 6,7,8,9,10 and a server head II are installed in the actuator 5 installed near each of the magnetic disks 1 to 3, and the actuator 5 allows each data to be , 10 to 10 perform seek operations on each data surface of each magnetic disk 1 to 3 to write/read data, while 11 reads servo information recorded on the servo surface of magnetic disk 3. It is supposed to be released. still,
In this embodiment, the configuration is such that three magnetic disks are mounted, but the configuration is not limited to this. Further, a CPU (central processing unit) 12 is mounted on the control board of the magnetic disk device, and the CPU 2 drives and controls the spindle motor 4 via a spindle motor control line 13 and controls the actuator via a head seek control line 14. 5 is drive-controlled. Furthermore, the CP
The U 12 supplies read/write signals to the data heads 6 to 10 via the data head R/W line 15, and to the servo via the servo signal line 16. The positioning of each data head 6 to 10 is controlled based on the servo information obtained. Further, the CPU 12 has a built-in timer 17 for setting a settling time, and a RAM (random access memory) for storing various data such as the amount of positional deviation of each data head 6 to 10 with respect to the target printer. 1
8 is built-in. Furthermore, a ROM (read only memory) 19 for storing a control program is externally attached to the CPIJ 12. In this case, the ROM19
It is also possible to have a configuration in which the CPU 12 has a built-in configuration. Next, the operation of the magnetic disk drive of this embodiment with the above configuration will be explained based on FIGS. 2 to 4. ◎Seek control during reading (Figure 2) Step SBI
, eput2 drives the spindle motor 4 via the spindle motor control line 13, and drives the magnetic disks 1 to 3.
By rotationally driving the data head and driving the actuator 5 via the head seek control line 14, the data head is sought to the target cylinder to be read. In this case, the CPU 12 positions the cylinder to the target cylinder based on the search information read from the servo surface by the press head 11 supplied via the servo head signal line 16 based on the data. Next, in step SB2, the CPU 2 determines whether or not the target cylinder has been reached for the M data, and if it is determined that the target cylinder has been reached, the CPU 2 stops the nok operation of the data head in step SB3. , performs preparation processing for the next cleavage readout control. When the read control preparation process is completed, in step SB4, the CPU 12 determines whether the processing time in step SB3 is shorter than the settling time of 3 m5ec, the total time of the processing time of step SB3 and the settling time of step SB4 is 3m lee. Perform Zanshichi tring (time adjustment) so that . By performing the above processing, it is possible to reduce the processing time when causing the data head to perform the next read control. ◎/-control during writing (Fig. 3) ST, B SCI
, the CPU 12 drives the spindle motor 4 via the spindle motor control line 13 to control the magnetic disks 1 to 3.
By rotationally driving the data head and driving the actuator 5 via the head/direction control line 14, the data head is sought to the target/printer to be written. In this case, the CPU 12 positions the data head to the target cylinder based on the search information read from the servo surface of the servo head 11 and supplied via the signal line 16.Next, in step S02 , the CPU 12 determines whether the child head has reached the target cylinder or not, and if it is determined that the child head has reached the target cylinder,
In step S03, the seek operation of the data head is stopped, and preparation processing for the next write control is performed. When the write control preparation process is completed, in step SC4, the CPU 12 determines whether the total time of the processing time in step SC3 and the settling time in step SC4 is 3m5ec if the process in step S03 is shorter than the settling time of 3m5ec. Perform residual settling (time adjustment) so that By performing the above processing, it is possible to reduce the processing time when causing the data head to perform the next write control. ◎Seek control l when detecting the amount of positional deviation (Fig. 4) In step SDI, the CPU 12 drives the spindle motor 4 via the spindle motor control line 13 to rotate the magnetic disks 1 to 3, and also outputs the head seek control line. By driving the actuator 5 via the actuator 14, the data head is sought to a specific cylinder in which a specific pattern for positional deviation detection (positional deviation information) is written in advance. Thereafter, when the CPU 12 finishes detecting the positional deviation information by the data head, it drives the actuator 5 to return the data head to its original cylinder position. Next, in step SD2, the CPU 12 calculates the amount of positional deviation of each data head when the data head reaches the stop target cylinder by a seek operation to return to the original cylinder position and is in a settling state, and calculates the positional deviation amount of each data head. Store the data in RAM18. and step S
In D3, cpuB performs residual settling (time adjustment) if it is determined to be necessary. By performing the above processing, it is possible to reduce the calculation processing time.

【Effect of the invention】

As explained above, according to the present invention, the present invention includes a magnetic head, a magnetic disk on which information is written or read by the magnetic head, and a drive means for moving the magnetic head in the radial direction of the magnetic disk. A magnetic disk drive comprising: a determining means for determining whether or not the magnetic head moved by the driving means has reached the target cylinder; and the determining means determines that the magnetic head has reached the target cylinder. In this case, since the magnetic head is configured to include a control means that performs a predetermined process within a preset settling time after stopping the magnetic head, the following effects can be achieved. Since other processing is executed prior to the next 7-k operation of the magnetic head within the settling time, it is possible to eliminate wasted time and speed up write/read processing, etc. when compared with conventional methods. You can achieve it.

[Brief explanation of drawings]

FIG. 1 is a control block diagram of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a flowchart showing an example of read/write control according to this embodiment, and FIG. 3 is a flowchart showing an example of write control according to this embodiment. FIG. 4 is a flowchart showing an example of seek control when detecting the amount of positional deviation in this embodiment, and FIG. 5 is a flowchart of conventional seek control. 1-3...Magnetic disk, 4...Spindle motor, 5...Actuator (driving means), 6-1
0...Data head (magnetic head), 11...
Servo head (magnetic head), 12... CPU (determination means, control means), 17... timer.

Claims (1)

[Claims] A magnetic disk device comprising a magnetic head, a magnetic disk on which information is written or read by the magnetic head, and a drive means for moving the magnetic head in a radial direction of the magnetic disk, wherein the magnetic head is moved by the drive means. determining means for determining whether or not the magnetic head has reached the target cylinder; and when the determining means determines that the magnetic head has reached the target cylinder, the magnetic head is stopped for a preset settling time; 1. A magnetic disk device comprising: a control means for performing predetermined processing within the magnetic disk device.