JPH0619399B2 - Disk test system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disk tester, and more particularly to a disk test system for a signal storage disk device used in an external storage device such as a computer.

[Technical environment]

In recent disk test systems, the capacity of measured data tends to increase as the density and capacity of disk devices increase, and the types of signal storage media and disk sizes vary. Along with higher reliability, there is a tendency for diversification of test conditions, test sequences, and increase of test types.

[Common technology]

Generally, the measurement of the disc test system can be roughly classified into the following three types of measurement at any position on the disc.

a) Physical property measurement for measuring fluctuations in physical constants on the disk surface that affect the amplitude of the reproduction signal. For example, measurement of disk surface deflection, measurement of disk surface accuracy of magnetic disk, measurement of eccentricity of pre-group track of optical disk,
For example, there is measurement of the reflectance of the optical disk.

b) At least one of non-recording, recording, and erasing on the signal storage medium
Playback signal measurement after performing one.

For example, the medium recording sensitivity measurement for measuring the reproduction signal amplitude after recording while changing the recording intensity (for example, the optical power incident on the medium for an optical disc, the magnetic flux density applied to the magnetic medium for a magnetic disc), or the erasing intensity (For example, in the case of a magneto-optical disk, the medium incident light power and the input magnetic flux density, in the magnetic disk, the magnetic flux density applied to the magnetic medium is changed.) There is a measurement of C / N, which is the ratio of the carrier frequency component of the reproduced signal after recording at 1. and the noise component at a certain frequency.

c) Defect measurement for detecting an amplitude change of a reproduction signal due to a defect in a signal storage medium after at least one of non-recording, recording and erasing, for example, a reproduction signal at the time of non-recording due to a defect in a medium. There are an extratler measurement for measuring a pseudo recording signal included therein, a dropout error measurement for measuring a drop in reproduction signal amplitude due to a medium defect included in a reproduction signal at the time of recording, and the like.

Therefore, the test of the signal storage disk is performed at any position on the disk, at least one of the relative speed between the signal storage medium and the recording / reproducing head, the storage frequency, the recording strength, the erasing strength, and the detection condition at the time of defect measurement. It is possible to perform the physical characteristic measurement, the reproduction signal measurement, and the defect measurement in combination by using the two as parameters and main variables, respectively.

[Conventional technology]

The conventional disc test system has a test condition creating means,
The test sequence creation means, the test control means, and the test result output means are included.

Next, a conventional disc test system will be described in detail with reference to the drawings.

FIG. 5 is a block diagram showing an example of a conventional disk test system.

The test condition creating means 11 sets the test condition K consisting of the position on the disk and the main variable of the parameter in the test control means 13, and the test sequence creating means 12 sets the three kinds of measurements corresponding to the test condition K. The test control means 13 measures a measurement sequence composed of at least one or more as a test sequence 1, and the test control means 13 controls the test by performing measurement according to the test condition K and the test sequence 1. To the test result output means 14,
The test result output means 14 converts the test data m into a diagram / tabular and outputs it as a test result n.

[Problems to be solved by the invention]

The conventional disk test system described above has the following drawbacks because the test conditions, test sequences, and test data are managed on the memory in the test control means.

(1) If the measurement conditions or measurement sequence are changed, there will be restrictions due to the memory configuration in the test control means.

(2) If the measurement contents that make up the test change and the test conditions, test sequence, and test data contents change, it is necessary to change the test condition creation means, test sequence creation means, and test result output means. , I can not support a wide variety of tests.

[Means for solving problems]

The disc test system of the present invention includes a measurement condition creating unit that creates a measurement condition including a position on a signal storage disc and at least two of a recording condition, a reproduction condition, and an erasing condition, and registers it in a storage unit, and a reproduction signal. At least one of physical characteristic measurement for measuring fluctuations in physical constants on the disk surface that affects amplitude and measurement of a reproduction signal after performing at least one of non-recording, recording and erasing on a signal storage medium and at least recording, erasing and erasing At least one with a defect measurement for detecting an amplitude change of the reproduced signal due to a defect of the signal storage medium after one
Measuring sequence creating means for creating and registering in the storage means a measurement sequence composed of two, and setting the measurement conditions read from the storage means to perform measurement according to the measurement sequence read from the storage means to obtain a measurement result. Measurement control means registered in the storage means, storage means for performing auxiliary storage of the measurement conditions, the measurement sequence, and the measurement result as a file group, respectively, the measurement sequence read from the storage means and the measurement conditions And a measurement result editing means for performing selection, aggregation, and calculation of the measurement results read from the storage means to create edited data necessary for a test, and a tabulation and plotting of the edited data, and a test result And a test result output means for outputting as.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

The measurement condition a, which is the output of the measurement condition creating means 1 included in the disk test apparatus shown in FIG. 1, is added to the storage means 4 and input to the measurement control means 3 from the storage means 4. The measurement result c of the measurement sequence creating means 2 is added to the storage means 4. The measurement control means 3 inputs the measurement condition a and the measurement sequence b from the storage means 4. Measurement result editing means 5
Inputs the measurement result c from the storage means 4 and outputs the edited data d to the test result output means 6. The test result e is output from the test result output means 6.

2 (a) to (e) are flowcharts for explaining the operation sequence of the present invention.

FIG. 2 (a) is a flow chart showing the main flow. After setting or registering the measurement conditions and measurement sequence, the test is started, the measurement conditions are read out and set, the measurement sequence is read out, the measurement is executed, and the measurement data is acquired. A flow for outputting a test result by repeating a series of sequences of writing the measurement result in the storage means and editing the measurement result is shown.

FIG. 2B is a detailed flowchart of the measurement condition creation flow, and shows the creation flow of the measurement condition of the measurement position, relative speed, recording frequency, recording intensity, erasing intensity, and defect measurement detection.

FIG. 2 (c) is a detailed flowchart of the measurement sequence creation flow and shows the creation sequence of the measurement sequence for physical measurement, reproduction signal measurement, and defect measurement.

FIG. 2 (d) is a detailed flow chart of the reading and setting flow of the measurement conditions. The measurement conditions are read from the storage means, moved to the measurement position according to the read data, and the relative strength / recording strength / erasing strength / recording frequency / The flow which sets a defect measurement detection condition is shown.

FIG. 2 (e) is a detailed flowchart of the measurement sequence reading and execution flow, and shows a flow of reading the measurement sequence from the storage means and performing physical measurement, reproduction signal measurement, and defect measurement according to the read sequence.

FIG. 3 is a block diagram showing an embodiment of the present invention, in which a disc recording / reproducing unit 22, a CRT / KB 24, a microcomputer system 21 connected to the disc recording / reproducing unit 22, and a CR
It is configured to include a T / KB 24, a hard disk 23, and a personal computer system 25 connected to a printer 26. In the disk test system of FIGS. 2 (a) to (e),
The measurement condition creating means 1 and the measurement sequence creating means 2 are
Each is composed of a microcomputer system 21 and a CRT / KB 24, the measurement control means 3 is composed of a microcomputer system 21 and a disk recording / reproducing section 22, and a storage means 4
Is composed of a hard disk 23, and the measurement result editing means 5
Is composed of a personal computer system 25 and a CRT / KB 24, and the test result output means 6 is composed of a personal computer system 25 and a printer 26.

Next, the operation will be described with reference to FIGS. 4 (a) to 4 (d). Fig. 4
(a) is a diagram showing measurement conditions and a measurement sequence. In FIG. 4 (a), the measurement conditions are the inner circumference and the outer circumference for the surface runout measurement, the inner circumference and the outer circumference are the measurement positions for the medium sensitivity measurement, and the recording strength is at each position. A, recording strength B, and recording strength C are shown. In addition, the measurement sequence is such that the surface runout is measured for each of the inner and outer circumferences.
It shows that the sequence of medium sensitivity measurement (at recording intensity A) → medium sensitivity measurement (at recording intensity B) → medium sensitivity measurement (at recording sensitivity C) is repeated.

4 (b) and 4 (c) are diagrams showing examples of the measurement results of the surface runout measurement and the medium sensitivity measurement, and the horizontal axis represents the rotation angle (ra) of the disk.
d), and similar measurement results exist for each measurement condition.

FIG. 4 (d) is a diagram showing an example of the test result. The measurement result obtained by the surface runout measurement is edited and the maximum value is output as a surface runout test result, and the measurement obtained by the medium sensitivity measurement is performed. The results are edited and the average value is output as a test result in a table.

〔The invention's effect〕

Since the disk test system of the present invention obtains the test result by registering the measurement condition, the measurement sequence, and the measurement result in the storage means and editing the measurement result, (1) there are various measurement conditions and measurement sequences. Even if it is diversified, it is not restricted by the memory configuration in each of the above means. (2) Even if the test is diversified, it can be dealt with by simply changing the measurement result editing means and the test result output means. There is an effect that it is easy to deal with.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
(a) to (e) are flowcharts for explaining the operation of the disk test system shown in FIG. 1, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIGS. 4 (a) to (d) are measurement results. FIG. 5 is an explanatory diagram showing an example of conditions, a measurement sequence, a measurement result, and a test result, and FIG. 5 is a block diagram showing a conventional example. 1 ... Measurement condition creating means, 2 ... Measurement sequence creating means, 3 ... Measurement control means, 4 ... storing means, 5 ... Measurement result collecting means, 6 ... Test result outputting means, 11 ... Test Condition creating means, 12 ... Test sequence creating means, 13
... Test control means, 14 ... Test result output means, 21 ...
… Microcomputer system, 22 …… Disk recording / playback unit, 2
3 ... Hard disk, 24 ... CRT / KB, 25 ...
… Personal computer system, 26… Printer.

Claims (1)

[Claims] 1. A position on a signal storage disk and recording conditions,
A measuring condition creating means for creating a measuring condition including at least two of a reproducing condition and an erasing condition and registering the measuring condition in a storage means;
The physical characteristics measurement for measuring the fluctuation of the physical constant of the disk surface which affects the amplitude of the reproduction signal and the reproduction signal measurement and the non-recording, recording after the recording / recording / erasing of the signal storage medium are performed. A measurement sequence for creating and registering in a storage means a measurement sequence including at least one of defect measurement for detecting an amplitude change of a reproduction signal caused by a defect of a signal storage medium after performing at least one of erasing. Creating means; measurement control means for setting the measurement conditions read from the storage means, performing measurement according to the measurement sequence read from the storage means, and registering measurement results in the storage means; the measurement conditions and the measurement sequence And storage means for performing auxiliary storage of the measurement result as a file group, the measurement sequence read from the storage means, and Measurement result editing means for selecting, tabulating, and calculating the measurement results read out from the storage means with reference to a fixed condition, and creating edit data necessary for the test; and tabulating and plotting the edit data. A disk test system comprising: a test result output means for outputting as a test result.