JPS5885976A - Non-tracking magnetic disk device - Google Patents

Abstract

PURPOSE:To eliminate control for the position of a data head when a magnetic disk is exchanged, by measuring the difference in position of each data head and storing the difference in a storage device. CONSTITUTION:A servo track 2 is sought on a servo disk 15 having the same cylinder number as a track 1 on a data disk 14 to which the servo information is recorded when the initial seeking is performed. Then the cylinder number, etc. are read, and then the cylinder number, etc. of the track 1 is read. In this case, a minute shift is given to an access arm with a diagnosis command to read the cylinder number, etc. of the track 1. The shift extent (a) of the access arm that is measured at that time is stored. When the actual data track on the disk 14 is sought, the extent (a) is added to the shift extent given to the servo track having the designated cylinder number of the disk 15. Thus a desired track on the disk 14 is sought.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk device, and relates to a non-tracking magnetic disk device that does not require adjustment of the position of a magnetic head (data head) when replacing a magnetic disk. The positions of the nine servo heads and multiple data heads attached to the arm are based on the servo disk's servo & track position, and when the servo head comes to this position, the data heads are placed at the track position of the same cylinder number on the multiple data disks. It is necessary to adjust the positions of multiple data heads so that the magnetic disks are replaced, but this has the disadvantage that it is very time-consuming. The purpose of the present invention is to provide a non-tracking magnetic disk device that does not require adjustment.

In order to achieve the above object, the present invention provides a magnetic disk drive in which each data disk has the same cylinder number.
The same servo information as the servo track of the servo disk is recorded on the track surface of each data disk.
trucks? iiK Move each data head, measure the difference in position between the servo head and each data head, and store it in the storage device. When seeking, add the difference in the position stored at the time of initial seek to the specified nine seek amount and calculate the desired result. This is a non-tracking magnetic disk device characterized by seeking to a position.

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

FIG. 1 shows that after the servo head 4 of the embodiment of the present invention reads the cylinder head of the servo track, the data head 3
2 is a diagram showing the relative positions when reading the cylinder number, etc. of the data track with the same cylinder number on which servo information is recorded. FIG. 2 is an embodiment of the present invention. 1/4 in plan view
Shows the part.

FIG. 3 shows a block diagram of the main parts of the circuit of the magnetic disk device according to the embodiment O of the present invention.

In the figure, 1 is a track where servo information is recorded, 2 is a servo track, 3 is a data head, 4 is a servo head, 5Fi
A disk support section, 6 is an interface circuit, 7 is a write/read control circuit, 8 is a register, 9 is an access control circuit, 10 is a seek operation control circuit, 11 is a mechanism control circuit, 12 is a PC reset control circuit, 13 14, 14' and 14' are data disks, and 15 is a servo disk.

The magnetic disk is an Aume guide pan (as shown in Figure 2)
There is a data track between the OGB (OGB) and the inner guide band (GB), and the servo track of the servo disk records servo information such as the cylinder number for positioning the access arm to which the magnetic head is attached. .

In the case of the present invention, one data track IK servo track at the same cylinder number position and servo information such as the same cylinder number are recorded on each data disk.

Therefore, as shown in FIG. 1, for example, track 1 on which servo information is recorded on the data disk 14 during Yesial Seek.
Seek the servo track 2t on the servo disk 15 with the same cylinder number, read the cylinder number,
Next, the cylinder number, etc. of data track 1 is read. If the cylinder number, etc. cannot be read at this time, diagnosis: 2. Move the access arm minutely using the cloak to read the cylinder number, etc. of data track 1. The movement l- (in the case of + or - in the case of FIG. 1, +) of the access arm at this time is stored in a storage device K such as a register, and the data track on the actual data disk 14 is sought. When searching for a data track on the target data disk 14, add the stored movement amount a to the movement amount of the servo disk 15 to the servo track of the specified cylinder number. If you memorize the amount of movement for each data disk in the same way, you can add this amount of movement during actual seek and move the data head to the desired data track on each data track. I can do it. Tracking is therefore unnecessary.

As for the electrical operation, during an initial seek, a control device (not shown) issues a command to seek the cylinder number of track 1 on which servo information is recorded on the data disk and read out the information on each track. This command causes the seek operation control circuit 100 to move the access arm via the interface circuit 6 and the access control circuit 9, and the movement mechanism control circuit 11 to move the access arm so that the servo head 4 moves to the specified location on the servo disk 15. The access arm moves to the servo track 2 with the cylinder number, reads the servo information such as the cylinder number under the control of the write/read control circuit 7, and confirms that the access arm has reached the predetermined position. stop. At this time, data track 14
．． The data head corresponding to 14', 14', etc. (the data head corresponding to the data track 14 is 3) writes information such as the cylinder number to the track in which servo information is recorded (track 1 in the data track 14) and reads the control circuit. 70 control. For data disks from which a correct cylinder number can be read, the data head does not require position adjustment. If there is a data track that cannot be read, the control device issues a diagnostic command and uses the control information from the seek operation control circuit 10 via the interface circuit 6 and access control circuit 9 to send the data to the p mechanism control circuit 1.
A track where servo information was recorded by minutely moving the access arm of one company (Track 1 in Data Track 14)
If the predetermined servo information is read out, the movement of the access arm is stopped by the access completion control circuit 130.
The amount of movement is detected by the position signal from the access arm.
This amount of movement is stored in the register 8. From this, the relative position of each data head and servo head attached to the access booth 5 can be determined. Therefore, during actual seeking, this amount of movement is determined by the control information of the operation control circuit 100, and when the access arm is moved by the mechanism control circuit 11, the amount of movement is determined according to each data head. The control information including the movement amount stored in step 8 is sent to the seek operation control circuit 10 and the mechanism control circuit 11 to move the access arm. This allows the data head to be moved to the data track of the desired data disk. Therefore, tracking is not necessary.

As explained in detail above, according to the present invention, it is not necessary to adjust the position of the magnetic head when replacing a magnetic disk.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention in which the V-drive 4 reads the cylinder number, etc. of the servo track, and then the data head 3 reads the cylinder number, etc. of the same cylinder number (2) on which the servo information was recorded. A diagram showing the relative positions when
Figure 2 shows the data disk of the embodiment of the present invention? - A section 174 is shown in a plan view with tracks in which voice information is recorded. FIG. 3 is a block diagram of the main parts of the circuit of the magnetic disk device according to the embodiment of the present invention. In the figure, 1 is a track where servo information is recorded, 2 is a servo track, 3 is a data head, and 4 is a servo a head, 5 a disk support section, 6 an interface circuit, 7 a write/read control circuit, 8 a register, 9 an access control circuit, 10 a seek operation control circuit, 11 a mechanism control circuit,
12 is a clock reset control circuit, 13 is an access completion control circuit, 14.14', 14' is a data disk,
15 is a disk.

Claims (1)

[Claims] In a magnetic disk device, servo information similar to the servo track of the servo disk is recorded on one track surface of the same cylinder number of each data disk, and servo information similar to the servo track of the servo disk is recorded on the one track surface of the iron-mounted data disk at the time of initial seek. Move each data head, measure the difference in position between the servo head and each data head, and store it in the storage device. When seeking, add the difference between the positions memorized during the initial seek to the specified seek amount to reach the desired position. A non-tracking magnetic disk device characterized by the ability to seek.