JPH03150743A - Magneto-optical recorder - Google Patents

Abstract

PURPOSE:To contrive the use of a user area in the case of the unabled detection of a sector mark by counting the time at every detection of the sector mark and outputting a pseudo sector mark with a magneto-optical recording device corresponding to an ISO format. CONSTITUTION:A sector mark detection means 1 detects a sector mark pattern out of a 2-7 code and outputs a detected sector mark. A time interval counting means 2 works synchronously with the detection of the sector mark to count the time intervals equivalent to one sector and outputs a pseudo pulse 16 at a every sector. A delay means 3 delays the pulse 16 and outputs it as a pseudo sector mark detection signal. The means 3, however, outputs no pseudo sector mark when the sector mark is detected. When no sector mark is detected, the time of the sector marks detected out of the preceding sectors are counted and the detected pseudo sector mark is outputted as a sector mark.

Description

[Detailed description of the invention] [Industrial application fields] The present invention is based on ISO format Regarding recording equipment.

[Prior Art] As shown in FIG. 6, a magneto-optical recording device compatible with the S○ format uses a rotating recording medium disc 17.

It consists of a data reading means 18 that exists on the recording medium disc 17 in a non-contact manner, a moving means 19 that moves the data reading means 18, and a data processing means 20 that processes the read data.

FIG. 7 conforms to the ISO format. 3 is a diagram showing the arrangement of tracks on a recording medium disk 17. FIG.

In the ISO format, a track groove 21 is spirally cut on the recording medium disk 17, and tracks, which are data recording units, are arranged along this groove. This one lap is called one track, and it is divided into 17 equal parts.
A sector is an even smaller data recording unit. The eighth factor is a diagram showing the relationship between tracks and sectors and the contents of the 2-7 code. Each sector consists of a sector address and a user area. There is a sector mark at the beginning of each sector, and in the data processing means 20,
The detection of this sector mark is used to read the sector address, read/write data, erase data, etc. in the user area.

The spiral of the raceway groove 21 is cut outward with respect to the rotational direction of the recording medium disk 17. Therefore, when the data reading means 18 is following the track groove 21C, it flows outward as the recording medium disc 17 rotates.If the data reading means 18 is kept on the same track, is once per track, orbit 1R21
This movement is hereinafter referred to as a track jump.The data processing means 20 detects 17 sector marks and recognizes one track.

[Problems to be Solved by the Invention] However, in the conventional technology, if sector marks are not detected due to local defects in the recording medium, etc.
Not only was it impossible to use the user area in that sector, but it also had the problem of not being able to recognize single tracks and not be able to jump tracks.

The present invention is intended to solve these problems, and its purpose is to create a magneto-optical system that allows the user area to be used even if there are several sectors where sector marks cannot be detected and allows for track jumps. The purpose is to provide a recording device.

[Means to solve the problem] The magneto-optical recording device of the present invention is shown in FIG.

sector mark detection means 1 and one time interval counting means 2;
It has delay means 3. FIG. 2 is a time chart showing the operation of the magneto-optical recording apparatus of the present invention.

The sector mark detection means 1 detects the sector mark pattern from the 2-7 code and outputs sector mark detection.The one time interval counting means 2 operates in synchronization with the sector mark detection and calculates the time interval of one sector one minute. Count and get 1
A pseudo pulse 16 is output once per sector. Delay means 3
delays the pseudo pulse 16 and outputs it as a pseudo sector mark detection signal. The delay means 3 does not output the pseudo sector mark detection when the sector mark detection is input, and when the sector mark is not detected at the beginning of the sector, it measures time from the position of the sector mark detected in the previous sector. hand.

By outputting pseudo sector mark detection at approximately the timing when sector marks are originally output,
Even if there are several sectors in which sector marks cannot be detected, the user area can be used and track jumping is possible.

[Example] A magneto-optical recording device of the present invention will be described below based on an example. FIG. 3 shows an embodiment of the present invention. It is a magneto-optical recording device. The sector mark detection means 6 detects a sector mark pattern from the 2-7 code and outputs a sector mark detection signal.The one time interval counting means 4 has a counter 7 and an oscillator 8. Since its contents are cleared by , it is resynchronized with the sector mark detection each time the sector mark detection is input. By counting the pulse 15 output by the oscillator 8, the counter 7
Count the time intervals of one sector and one minute. counter 7 is 1
After counting the time interval for sectors, a counter output 12 is output. The delay means 5 has a one-shot 9, a shift register 10, and two manual AND gates.The one-shot 9 outputs a one-shot output 13 when sector mark detection is input. The shift register 10 delays the counter output 12 by a certain period of time and outputs it as a shift register output 14.

By the action of AND gate 11, one-shot output 1
3 is not output, shift register output 14
When is output, pseudo sector mark detection is output. FIG. 4 is a time chart when a sector mark is detected at the beginning of each sector and the sector mark detection is output.

Sector mark detection is output at the end of sector mark pattern (SEC,M). Counter output 1 is generated at a timing slightly delayed from the sector mark detection pulse.
2 is output. A one-shot output 13 is output triggered by the sector mark detection pulse. The shift register output 14 is output after a certain time delay from the counter output 12, but at this time the one-shot output 13
is output, so pseudo sector mark detection is not output.

FIG. 5 is a time chart when no sector mark is detected at the beginning of a certain sector. No sector mark detection is output at the end of the second sector mark pattern (SEC, M).

However, the counter output 12 is output after a time interval of one sector and one minute from the counter output 12 of the first sector. A shift register output 14 is output after a certain time delay from the counter output 12. In the second sector, since the one-shot output 13 is not output, pseudo sector mark detection is output.

[Effects of the Invention] As explained above, according to the present invention, when a sector mark cannot be detected, the time is counted from the detection of a sector mark detected in a sector before that sector, and one original sector mark is detected. Pseudo sector mark detection is output at the approximate timing when . By treating the pseudo sector mark detection as the same as sector mark detection, there is an effect that data processing operations such as reading and writing data can be performed even in sectors where no sector mark has been detected. Further, by counting the pseudo sector mark detection as the same as sector mark detection, it is possible to recognize 17 sectors, that is, one track, thereby making it possible to perform track jabs.

face

[Brief explanation of the drawing]

FIG. 1 is a diagram of a magneto-optical recording device of the present invention. FIG. 2 is a time chart showing the operation of the magneto-optical recording device of the present invention. FIG. 3 is a diagram of a magneto-optical recording device in an embodiment of the present invention. FIG. 4 is a time chart showing a case where a sector mark is detected at the beginning of each sector and the sector mark detection is output in an embodiment of the magneto-optical recording device of the present invention. FIG. 12 is a time chart when a sector mark is not detected at the beginning of a certain sector in an embodiment. FIG. 6 is a diagram showing the system configuration of the magneto-optical recording device. FIG. 7 conforms to the ISO format. FIG. 3 is a diagram showing the arrangement of tracks on a recording medium disk 17; FIG. 8 is a diagram showing the relationship between tracks and sectors and the contents of the 2-7 code. - Sector mark detection means. - Time interval counting means. 3...Delay means. 4 ・ 5 ・ ・ 0 7 ・ 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ・Time interval counting means.・Delay means. - Sector mark detection means. -Counter/oscillator.・One-shot shift register.・Two-person logical product gate.・Counter output.・One-shot output.・Shift register output. ·pulse.・Pseudo pulse.・Recording medium disc ・Data reading means ・Transportation means ・Data processing means ・More than raceway groove

Claims (1)

[Claims] In a magneto-optical recording device compatible with ISO format, 2
−7 sector mark detection means for detecting a sector mark pattern from a code and outputting sector mark detection; time interval counting means for counting time intervals in response to the sector mark detection; and output of the time interval counting means. 1. A magneto-optical recording device comprising a delay means for delaying a pseudo pulse to detect a pseudo sector mark and outputting the delayed pseudo pulse as a pseudo sector mark detection.