JPS62119701A - Inspecting instrument for magnetic disk recorded - Google Patents

Abstract

PURPOSE:To easily inspect and analyze minute discrepancies in recording position, etc., by reading out the information of a magnetic disk by positioning a magnetic head not only to the central position of a writing track but also to each position which is slightly deviated to both side edges from the central position and displaying discriminated results whether or not readout from the positions is possible. CONSTITUTION:Each writing track 42 is separated from each other by a distance corresponding to the rotation of the four step angles of a stepping motor 21. An inspecting instrument causes a magnetic head 16 to read information recorded on each writing track 42 by slightly moving the head 16 to the internal and external peripheral edges of each track 42 from the central position of each track and discriminates and displays results whether or not readout from the positions is possible. It ought to be that, in the case of a normally recorded magnetic disk 14, signals can be read at positions P1 and P2 as well as P0 even though the signals levels drop to <=1/2 and cannot be read at positions P3 and P4 because those positions are the central positions of an erasing track 49. Such inspection is performed on all of the writing tracks 42 of the magnetic disk 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a testing device for a magnetic disk recording device, and particularly to a testing device that can easily test the state of writing on a magnetic disk.

[Conventional technology]

Conventionally, in order to inspect and analyze the state of writing on magnetic disk media such as 70 disks, the magnetic disk media was developed magnetically, and the resulting pattern was observed with a microscope to check for minute misalignments in the recording device. Ta. For this reason, the equipment required for analysis is very expensive, and the magnetic disk itself is also disposable because it is magnetically developed, resulting in a problem in that it requires a lot of cost and effort.

[M points while the invention is trying to solve]

The present invention has been made to solve the above-mentioned problems, and allows the writing state of magnetic disk media to be easily inspected and analyzed in a short time, and the inspection has a simple configuration! The purpose is to provide Iff.

[Means for solving problems]

For this reason, the present invention includes a write track for recording a desired information signal on a magnetic disk by a magnetic head positioned by a stepping motor along the surface of the magnetic disk between its outer and inner circumferences; A magnetic disk recording vtf in which erasing tracks for erasing both edges of the writing track are formed! ! In the inspection apparatus, as shown in FIG. 1, means for moving and positioning the magnetic head to each equally divided position from the center position of one write track to the center position of erase tracks on both sides; A means for reading information recorded on a magnetic disk at each equally divided position, determining whether reading of each sector on the track is possible or not, and displaying the determination result for each track. An inspection device for magnetic disk recording *lff is provided, which is characterized by the following.

[Effect]

According to the above configuration, information on the magnetic disk is read by positioning the magnetic head not only at six positions in the write track, which are the regular read positions, but also at each position slightly moved to both sides of the track. The judgment result of whether or not reading was possible at the position is displayed, so by observing the judgment result, it is clear at a glance which position reading was possible and which position was not possible, and it is possible to check the recording position. Minute deviations, etc. can be easily calibrated and analyzed.

〔Example〕

Examples of the present invention will be described below. This will be explained in detail according to the first page.

FIG. 2 is a block diagram showing the inspection device and magnetic disk recording device.

The inspection device consists of a computer 1 and a printer 2 connected to it. The computer 1 is a small computer having a central processing unit 4, a read-only memory 5, a temporary memory 6, an interface circuit 7.8, etc., and serves as a host computer for the magnetic disk recording device R113, and is composed of a microcomputer. is also possible.

The printer 2 is used as a judgment result display means.

The mechanical structure of the N-parallel magnetic disk system [i'[3] will be briefly explained with reference to FIG.

A rotary motor 13 is fixedly mounted on the base 11 and has an output shaft 12 protruding perpendicularly to the base 11. A disk-shaped support 15 for supporting a magnetic disk 14 such as a hard disk or a floppy disk is fixed to the output shaft 12. Certain times 11 due to 13! It is designed to be rotated at high speed. The magnetic head 16 is positioned along the surface of the magnetic disk 14 between its outer and inner peripheries. That is, a pair of parallel idle rods 17 and 17' are supported by the supporting frame 18 in a plane parallel to the base 11, and the magnetic head 16
The head transfer table 19 to which the
, 17'. Support 7
A stepping motor 21 for rotationally driving a feed screw 20 parallel to the idle rods 17 and 17' is fixed to the frame 18, and the head transfer table 19 is threadedly engaged with the feed screw 20. Then, the stepping motor 21
In order to prevent the feed screw 20 from rattling due to 'Rv' of the output shaft in the ring direction, the feed screw 20 is biased in the ring direction by a leaf spring 22.

When the stepping motor 21 is rotationally driven, the magnetic disk 16 is moved in the radial direction of the magnetic disk 14 and positioned at a predetermined location. The stepping motor 21 is 2
This is a two-phase excitation stepping motor equipped with a set of excitation coils. Then, by rotating the output shaft of the stepping motor 21 by 4 step angles, the magnetic head 16 moves from one write track on the magnetic disk 14 to the next write track, and by rotating by 2 step angles, the magnetic head 16 moves from one write track to the next write track on the magnetic disk 14. The pitch of the feed screw 20 is configured so that it moves over the erase track in the leap of the write track. and,
The magnetic head 16 is configured to be able to move from the outermost "track 0" position of the magnetic disk 14 to the innermost "track 79" position by 80 tracks.

A slit 23 is provided in the circumferential side wall of a disk-shaped support 15 that supports the magnetic disk 14 .

A 7-tooth coupler 24 consisting of a light emitting diode and a 7-ton transnoster is arranged on the base 11 so as to sandwich the peripheral side wall thereof. The 7-otokapfu 24 detects the rotational position of the magnetic disk 14, that is, the index position, by detecting the slit 23 on the circumferential side wall, and outputs an index signal (INDEX
) occurs.

The explanation will be given again with reference to FIG.

The magnetic disk recording device fi3 has a write/read control combiner 31 composed of several integrated circuits (for example, Mitsubishi Electric M5W1 93-02P, etc.).

The write/read control combiator 31 executes control according to commands from the combiator 1 of the inspection device, causes the printer drive circuit 34 to supply drive power to the rotary motor 13, and rotates the magnetic disk 14 at a constant rotation speed. 11! While driving the magnetic head 16, the magnetic head 16 is positioned at a designated location by causing the magnetic head drive circuit 33 to supply drive pulses to the stepping motor 21 in accordance with commands from the combinator 1. Then, the signal stored on the magnetic disk 14 is read out via the head reproducing/recording circuit 32 and transmitted to the combiator 1. Further, the magnetic head 16 is positioned at a designated location according to a command from the computer 1, and data transmitted from the combinator 1 is written to the designated location on the magnetic disk 14 in response to an index signal from the 7-oto coupler 24.

The operation based on the above eight-guard configuration will be explained.

As shown in FIG. It consists of a post ampoule section 45. Each sector 44 has an ID field 46 in which the address of each sector is recorded.
and a data field 47 for recording data, and gaps 48 are provided before and after these to protect the data from rotational fluctuations and mechanical dimensional errors.

In addition, in order to prevent information signals previously recorded on the magnetic disk 14 from remaining unerased and reading information signals that should have been erased, the four sides of the writing track 42 where information signals are recorded are provided. An erase track 49 where data has been erased is provided at the edge to prevent information signals from remaining erased.

Figure 5 shows a single ear magnetic head 1 with a simple structure.
FIG. 6 is an illustration showing a write track 42 and an erase track 49 formed using A.6.

Each writing head 42 is separated by a distance corresponding to four step angles of rotation of the stepper motor 21. and,
The inspection device reads the information recorded on the write tracks 42 at positions where the magnetic head 16 is moved slightly from the center position of each write track 42 to the inner and outer periphery edges.
It is determined and displayed whether reading was possible at that position. For example, taking the track 38 shown in FIG. 5 as an example, there is a position PO in the track 38, a position P1 where the stepping motor 21 is moved one step angle in the outer circumferential direction, and a position P1 where the stepping motor 21 is moved one step angle in the inner circumferential direction. At each of the five positions, P2, 111P3, which is moved by two step angles in the outer circumferential direction from the center position PO, and 11P4, which is moved by two step angles in the inner circumferential direction, the information of track [38], that is, each of the nine It is determined whether the information in the ID field 46 and data field 47 of the sector 44 can be read and displayed. On the magnetic disk 14 that has been properly recorded, it is readable, although the signal level drops to 172 or less at positions P1 and P2, as well as position PO, and positions within the erase track 49 at positions P3 and P4. Therefore, it should be unreadable. Such a test is performed on all write tracks 42 on the magnetic disk 14.

FIG. 6 is a 70-chart showing the actual processing in the combiator 1 that implements the above-described operation.

When the process starts, index K is first set to 0 in step 101. The index is used to specify the track to be inspected.

Next, in step 102, the magnetic head 16 is moved to the center position PO of the track (K).

Initially, since 0=0, the track (0) is positioned at the center of the outermost write track.

Next, in step 103, index i is set to 0. Index i is the center position 1po of each write track 42
and is used to specify the positions P1 to P4 of the side edges of the inner and outer peripheries.

In step 104, the information on the write track 42 is read, and in the next step 105, it is determined whether or not each ID field 46 and data field 47 of each sector 44 of the write track 42 can be read. In the next step 106, the determination result is stored in a predetermined memory 6.

In step 107, 1 is added to the current value of index i, and the next position to position the magnetic head 16 is specified. That is, if index i = 1t', step 1
Proceeding from step 08 to step 109, the magnetic head 16 is moved and positioned to position P1, which is moved by one step angle in the outer circumferential direction.If index i=2, the process proceeds from step 110 to step 111, and the magnetic head 16 is moved one step angle in the inner circumferential direction. If the index i=3 at the moved position P2, step 112
Then, the process proceeds to step 113, and if index i=4, step 1 is moved to position P3, which is moved two step angles toward the outer circumference.
Proceed from step 14 to step 115, and 2 step angle 81 to the inner circumference! 1G magnetic head for each fiP4 on IJ side
move. Then, the process returns to step 104 again, and the reading determinations and determination results in each of P1 to P4 are stored. Since the reading judgment storage at each position PO to P4 becomes the end needle index i=5, the process advances from step 114 to step 116.

In step 116, all 80 tracks ((0)
- It is checked whether or not the test has been completed for (79)). In other words, the index specifying the track = 79
If not, since the inspection is still in progress, proceed to step 117, add 1 to the value of the index, in other words, specify the t-included track one track on the inner circumference side, and return to step 102.
Repeat the above process.

If the index = 79 in step 11G, the inspection has been completed, and the process proceeds to step 118, where the determination result stored in step 106 is outputted to the printer 2.
Finish the process.

FIGS. 7 and 8 show examples of display of the printed judgment results, with FIG. 7 showing a normal case, and FIG. 8 showing an example when the recording position on the magnetic disk is deviated.

The determination result is the determination result in the ID field 46 (201 in the figure) and the determination result in the data field 47 (201 in the figure).
02) and are displayed in sectors 44 from 1 to 9.
are arranged horizontally in this order. In addition, the determination results at each position PO to P4 on the center and both side edges of each write track 42 are arranged vertically in the order of P3, Pl, PO1P2, P4 from the outer circumference side. The number 203 in the figure indicates the sector. Number 204
The numbers shown in the figure represent track numbers. The locations where the judgment results could be read are displayed blank, that is, nothing is printed, and the locations where the judgment results could not be read are displayed as "7".
A mark will be printed.

As shown in Figure 7, on a magnetic disk where data has been recorded correctly in the correct position, 7 marks are displayed on all locations 205 and 206 corresponding to lP3 and P4, which are two step angles away from the track center, making reading impossible. This shows that the positions 207, 208, and 209 corresponding to positions PO1P1 and P2 near 6 in the track are all displayed blank, indicating that they can be read.

On the other hand, on a magnetic disk where the recording position is slightly shifted, as shown in FIG.
A 7 mark is displayed in the location 210 corresponding to 1 and cannot be read, or a blank is displayed in a part of the location 211 corresponding to the position P4, which is the center position of the main erase track 49 and should be unreadable. This indicates that it has been determined that it is possible.

In this way, each sector 44 of every track 42, each I
Since the judgment results of the D field 46 and the data field 47 are displayed in a pattern on a sheet of paper, the writing status and the deviation of the recording position over the entire magnetic disk 14 can be seen at a glance, making it easy to write. Conditions can be inspected and analyzed. Therefore, adjustments, performance tests, compatibility tests, etc. of the magnetic disk recording device can be easily carried out in a short time.

In this embodiment, the printer 2 is used as a display means to print on paper, but the display device (
Of course, it is also possible to use CR1').

〔Effect of the invention〕

As explained above, since the present invention has the above configuration,
The present invention has excellent effects in that the state of writing on magnetic disk media can be easily inspected and analyzed in a short time, and the configuration is extremely simple.

[Brief explanation of drawings]

11th! I is a diagram clearly showing the configuration of the invention, FIG. 2 is a block diagram of an inspection device and a magnetic disk recording device, FIG. 3 is a front view showing mechanical pathology, and FIG. 4 is a diagram of tracks formed on a magnetic disk. 5 is a schematic diagram showing the adjacent tracks, FIG. 6 is a flowchart showing the actual processing, and FIGS. 7 and 8 are diagrams showing printed display examples. be. DESCRIPTION OF SYMBOLS 1... Computer, 2... Printer, 3... Magnetic disk recording device, 14... Magnetic disk, 16.
...Magnetic head, 21...Stepping motor, 42
...Writing track, 49...Erasing track. Agent Patent Attorney Isamu Goto Figure 1 Figure 4 Figure 5 P4 P2 POPI P3 ID DATA Tr 1234567B91237L56789 τ
r74? ? ? 73 Figure 8 Drawing 0 Engraving (No change in contents) ID
DATA ID
DATA123456789 123
,! 567B9 Dingr 123456789
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? ? ηη praise? °1? ? 72? ? 67? ? ? □□□Procedural Amendment (Method) February 1986 $ Date

Claims (1)

[Claims] 1. A write track for recording desired information signals on a magnetic disk by a magnetic head positioned by a stepping motor along the surface of the magnetic disk between its outer and inner circumferences. , and erase tracks for erasing both side edges of the write track are formed, wherein the magnetic head is moved from the center position of one write track to the center position of the erase track on both side edges. means for moving and positioning to each equally divided position, and reading information recorded on the magnetic disk at each equally divided position, and determining whether or not each sector on the track can be read. , and means for displaying the determination result for each track. 2. Claim 1, wherein each of the equally divided positions corresponds to each step position of the stepping motor, and the positioning means is a means for stepping the stepping motor. An inspection device for a magnetic disk recording device as described above. 3. The inspection device for a magnetic disk recording device according to claim 1, wherein the display means is a printout device. 4. The inspection device for a magnetic disk recording device according to claim 1, wherein the magnetic head is a single-gap magnetic head.