JPS63282906A - Magnetic disk recording 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 "Field of Industrial Application" The present invention relates to a magnetic disk recording device, and particularly to a recording device that can avoid minor defects in magnetic disks.

``Prior Art'' Conventionally, in this type of recording apparatus, the writing start position of each recording track has been fixed by hardware, such as the position where an index detector detects an index hole on a magnetic disk. Furthermore, defects in a magnetic disk have been discovered by checking whether the format was correctly recorded when initializing the format of the magnetic disk. If the format cannot be read correctly, the magnetic disk is determined to be defective, but the recording track is designated as a defective track, and the recording track is not used.

Therefore, if a small portion of a magnetic disk has a defect such as a slight scratch, the entire magnetic disk becomes defective and becomes unusable, or the number of usable tracks decreases.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to provide a magnetic disk recording device that can use a magnetic disk while avoiding the defective portion.

``Means for Solving Problems J'' Therefore, in the present invention, a magnetic disk is recorded using a soft sector method in which sectors of each recording track are formed from arbitrary circumferential positions on the magnetic disk without using an index signal. A recording device, comprising a recording means for recording a predetermined format from an arbitrary circumferential position on one recording track, a confirmation means for reading data from the recording track and detecting an error in the read format, and an error. and a re-recording means for re-recording a predetermined format of the recording track from any circumferential position of the recording track when the recording track is detected, and the plurality of means are sequentially repeated to cover the entire surface of the magnetic disk. A magnetic disk recording device is provided which is characterized by comprising initialization means for recording in a predetermined format.

"Operation" According to the above configuration, if the format is not recorded correctly at the time of format initialization due to a defect such as a scratch on the magnetic disk, the format of the recording track is recorded and rewritten again.

Since recording of the recording track format starts from an arbitrary position on the circumference, the position on the circumference where a significant part of the format is recorded shifts each time the track is rewritten. Therefore, by rewriting the data several times, the defective portion of the magnetic disk is placed in a portion that does not affect recording, such as the gap portion of the track, and defects in the magnetic disk can be avoided.

“Example” An example of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows the main parts of a magnetic disk recording device. A rotary motor 13 having an output shaft 2 protruding perpendicularly to the base 11 is fixedly mounted on the base 11 . A disk-shaped support 15 for supporting a magnetic disk 1 such as a hard disk or a floppy disk is fixed to the output shaft 12, and the magnetic disk 1 is rotated by a rotary motor 13 in a plane parallel to the base 11. It is designed to be rotated at a constant rotation speed. The magnetic head 16 is positioned along the surface of the magnetic disk 1 between its outer and inner peripheries. That is, a pair of guide rods 17, 17'' parallel to each other support frame 18 in a plane parallel to base 11.
The magnetic head 16 is supported by a fixed head transfer table or guided along its guide rod 17, 17'. A stepping motor 21 that rotationally drives a feed screw 20 parallel to the guide rods 17 and 17' is fixed to the support frame 18, and the head transfer table 19 is screwed with the feed screw 20. In order to prevent rattling of the feed screw 20 due to play in the axial direction of the output shaft of the stepping motor 21,
The feed screw 20 is urged in the axial direction by a leaf spring 22.

When the stepping motor 21 is rotationally driven, the magnetic head 16 is moved in the radial direction of the magnetic disk 1 and positioned at a predetermined location. The stepping motor 21 is a two-phase excitation force type stepping motor equipped with two sets of excitation coils. The pitch of the feed screw 20 is configured such that the rotation of the output shaft of the stepping motor 21 by one step angle causes the magnetic head 16 to move over the magnetic disk 1 by a distance of 1/4 of the gap width.

Further, a photocoupler 24 is provided on the base 11 to detect the projection 23 of the head transfer table 19, and detects that the magnetic head 16 is located at the outermost track position of the magnetic disk 1, that is, at the origin.

FIG. 2 is a block diagram showing the circuit configuration of the magnetic disk recording device.

The magnetic disk drive circuit 31 is an integrated circuit (for example, Mitsubishi Electric 851017^P) in which a read circuit section, a write circuit section, a stepping motor drive signal generation circuit section, a modulation/demodulation circuit section, and a logic circuit section are housed in one package. It consists of the main elements. The magnetic disk drive circuit 31 directly drives the coil of the magnetic head 16, and drives the stepping motor 21 and the rotary motor 13 via drive circuits 32 and 33 each comprised of a power transistor. The magnetic disk drive circuit 31 is controlled by a magnetic disk control circuit 34.

The magnetic disk control circuit 34 is an integrated circuit (for example, Mitsubishi Electric's N5W1793-0) that houses an interface section, a logic operation circuit section, various registers, etc. in one package.
2P) as the main elements. The magnetic disk control circuit 34 is connected to the computer 35 through various control lines such as a data bus and interrupt requests, and controls the magnetic disk drive circuit 31 based on information from the computer 35.

The magnetic disk control circuit 34 executes control according to a pre-stored program, and causes the drive circuit 32 to control the rotary motor 1.
3 to rotate the magnetic disk 1 at a constant rotational speed, and in accordance with instructions from the computer 35, the drive circuit 33 supplies drive pulses to the stepping motor 21 to position the magnetic head 16 at a designated location. At the same time, the signal stored on the magnetic disk 1 is read out and transmitted to the computer 35. Further, the magnetic head 16 is positioned at a designated location according to a command from the computer 35, and the data transmitted from the computer 35 is written to the designated location on the magnetic disk 1.

FIG. 3 is a schematic diagram showing a track format formed by the above hardware configuration.

A recording track 2 of the magnetic disk 1 is composed of a preamble section 3 starting from an arbitrary position 10 on the circumference, a plurality of (for example, 12) sectors 4 following the preamble section 3, and a remaining postamble section 5. Each sector 4 has an identification field 6 in which the address of each sector is recorded, and a data field 7 in which data is recorded.
A gap 8 is provided before and after these to protect data from rotational fluctuations and mechanical dimensional errors.

In addition, in order to prevent information signals previously recorded on the magnetic disk 1 from remaining unerased and reading out information signals that should have been erased, the edges of the recording track 2 on which the information signals are recorded are An erase track 9 on which data has been erased is provided. In order to use a blank magnetic disk 1 on which nothing has been written, the magnetic disk should be pre-recorded with a predetermined format as described above over all tracks between the inner and outer circumferences of the magnetic disk 1. initialization,
In other words, it is necessary to record the format.

FIG. 4 is a schematic diagram showing the recording track 2 formed when the magnetic disk 1 is initialized, and FIG. 5 is an explanatory diagram showing the sequence of the initialization operation.

First, the magnetic head 16 is positioned at a position IPI one step closer to the outer circumference than the position P2 of the outermost recording track [0], and erases that position iP1 over the entire circumference (=8-) (as shown in FIG. ). Next, the magnetic head moves two steps toward the inner circumference, and moves to a position P3 closer to the inner circumference.
(indicated by E in the figure). Next, return to the outer circumferential direction by one step, and move to the outermost recording track [0] position ff1.
At P2, a predetermined format is recorded from any position on the circumference (indicated by W in the figure).

Next, the recorded format is read out at RP2 with the magnetic head left as it is, and it is confirmed that there is no error in the format data (indicated by R in the figure). Then, it moves three steps to the position P4 in the inner circumferential direction and repeats the same operation sequentially to create a recording track 2 and an erasing track 9 with a track width corresponding to the gap width of the magnetic head 16 over the entire surface of the magnetic disk 1. Form.

If an error is detected during the successive confirmation (R) of each recording track 2, as illustrated in track [1] in FIG.
The magnetic head 16 is moved to the inner and outer peripheries of the track [1] to erase the recorded format (E), and the recording of the format of the recording track [1] is performed again (W). By re-recording the format, the recording start position 10 of the recording track is shifted, and the defective part of the magnetic disk 1 that caused the error is located in the preamble section 3.
, the postamble section 5, or the gear section 8, which do not affect recording.

After several rewrites (W), if no errors are detected during successive confirmation (R), the track moves to the next recording track [2] and continues recording in the format.

FIG. 6 is a flowchart showing the processing performed by the computer 35 that implements the initialization means described above. For simplicity, only the portion for recording the format of one recording track is shown here.

When the process 100 is started, first in step 101 the magnetic head 16 seeks a predetermined track 2 . The first track is the outermost track [0]. Next, in step 102, a one-step magnetic head 16 is placed on the outer circumferential side of the track.
Move and delete that position. Next step 103
Now, erase the position on the inner circumference side. In step 104, the track position is returned to the center and a track format consisting of 12 sectors 4 is recorded. Next, in step 105, the just-recorded track format is read out and checked for errors. In step 106, it is checked whether an error is detected in the read format. If an error is detected, the process returns to step 102 via step 107, and the processes of steps 102 to 106 are repeated to rewrite the format of the recording track. If there are no errors, the process proceeds from step 106 to step 109, and the recording of the format of the current recording track is completed. On the other hand, even if you rewrite it more than 4 times,
If an error is detected, the process proceeds from step 107 to step 108, where error processing is performed to notify that the magnetic disk 1 is defective, and processing 100 is ended. In this way, the process 100 is executed for each record 1 to rack 2, and the magnetic disk 1 is initialized.

As described above, this embodiment attempts to force the defective portion of the magnetic disk 1 into the gap 8 or the like by re-recording the format. recording track 2
The ratio of gap 8, etc. on the entire circumference of the disk is only about 10%, and it is thought that the probability that a defective part will be accidentally driven into the gap 8, etc. by several rewrites is relatively low. In some places, it seems as though it is not very effective. However, in reality, the occurrence of defects in the magnetic disk 1 could be largely avoided. This is considered to be because if the defect is minor, even if the defect exists in the identification field 6 or the data field 7, it may not lead to a reading error depending on its location.

FIG. 7 is a waveform diagram showing the relationship between the residual magnetism recorded on the recording track 2 of the magnetic disk 1 and the successive voltage of the magnetic head 16.

A signal is recorded in the recording track 2 as a reversal of magnetization (A). The read voltage (B) from the magnetic head 16 becomes a voltage corresponding to the change in residual magnetism (A), and the magnetic disk drive circuit 31 takes its differential output (C) and outputs the differential output (
Detect the moment when C) crosses zero and output pulse (D)
is generated and the reversal of magnetization is detected.

For example, if there is a defect 51 in the vicinity where the direction of residual magnetism (A) is reversed, the read voltage (B) from the magnetic head 16 changes greatly near its peak value, as shown by the broken line 52 in the figure. The differential output (C) also changes greatly as shown by the broken line 53, causing erroneous pulses 54 and 55 in the output pulse (D), which directly leads to data reading errors. On the other hand, if the slight defect 61 is located near the center between the magnetization reversal positions, the read voltage (B) from the magnetic head 16 will not change significantly, and an error pulse may be generated in the output pulse (D). do not have.

In this way, even on data field 7, depending on its position, there are parts that are sensitive to defects and parts that are not, so we believe that it is possible to avoid the effects of minor defects by simply shifting the position and rewriting. It will be done.

"Effect of the Invention J As explained above, the present invention has the above configuration, and includes means for re-recording a predetermined format of the recording track from any circumferential position of the recording track when an error is detected. This has an excellent effect in that the magnetic disk can be used while avoiding minor defects in the magnetic disk.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a front view showing the main parts of a magnetic disk recording device, FIG. 2 is a block diagram showing a control circuit, and FIG. 3 is a track format formed on a magnetic disk. FIG. 4 is a schematic diagram showing the recording track formation process, FIG. 5 is an explanatory diagram showing the initialization operation, FIG. 6 is a flowchart showing the actual process, and FIG. 7 is a diagram showing the formation of magnetic heads. FIG. 3 is a waveform diagram showing voltage. 101. magnetic disk, 21. , recording track, 41
6. Sector, 811. Gap, 10. ,,recording start position, 16. ,,magnetic head, 310. magnetic disk drive circuit, 34, magnetic disk control circuit, 35. ,,Computer. Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] A magnetic disk recording device that performs recording using a soft sector method in which sectors of each recording track are formed from arbitrary circumferential positions on a magnetic disk without using an index signal, the recording device comprising one recording track. a recording means for recording a predetermined format from an arbitrary circumferential position on the top; a confirmation means for reading the data of the recording track and detecting an error in the read format; re-recording means for re-recording a predetermined format on the recording track from any circumferential position; and initialization means for recording the predetermined format over the entire surface of the magnetic disk by sequentially repeating the plurality of means. A magnetic disk recording device comprising: