JPS615476A - Storage 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] [Industrial Application Field] The present invention provides a sector pulse correction method for correcting with a pseudo sector pulse when a sector pulse pattern recorded in advance on a recording medium cannot be detected normally. Regarding.

With the development of information processing technology, various methods for storing information have been developed and put into practical use. These can be roughly divided into semiconductor devices.

They are broadly divided into those that store electronically, such as cores, and those that store magnetically, such as magnetic disks and magnetic tapes.

In addition to these, magnetic bubbles, optical disks, etc. have recently been developed and put into practical use.

Among the above, magnetic disks, magnetic tapes, optical disks, etc.
is used as an external storage device that forms an important part of information processing systems, which have recently become more sophisticated and complex in usage. There was a desire to improve the device and put it into practical use.

[Conventional technology]

As a conventional technique, an optical disk device having one disk-shaped recording medium will be taken as an example and explained with reference to one drawing.

FIG. 2 shows the track format on an optical disc medium.

In the figure, (l) is a track format l-, +21
is the sector pulse signal, (3) is the count value for setting the time period that starts from one sector pulse signal (2) and receives the next sector pulse signal (2), and (4) is the sector in the normal time period. Sector pulse reception window for setting reception of pulse signal (2), a is sector, b is sector pattern part, C is gear part, d is sector address part, e is data part, N is sector pulse reception window (4) The start time and α indicate the time width of the sector pulse reception window (4), respectively.

As shown in Figure 2, optical disk media have a track format (1
There is a method that adopts 1.

In the above method, user data is recorded in the data section e.
When reproducing, the starting position of the predetermined sector a is recognized by detecting the sector pattern part.

Read the attributes of a predetermined sector a in the sector address part d, confirm that it is the predetermined sector a instructed by a host device (not shown), and record the predetermined data in the data part e.
Perform playback.

[Problems to be Solved by the Invention] 1. When recording/reproducing predetermined data in the data portion e using the above method, the sector pattern portion indicating the starting position of the predetermined sector a may be deleted for some reason (for example).

If it cannot be detected due to a defect in the medium, etc., subsequent operations (recording/reproducing of specified data, etc.) will be impossible, and the sector pattern section detection operation will be performed again based on instructions from the host device (not shown). There was a problem with repeating.

[Means for solving problems]

An object of the present invention is to realize a novel sector pattern correction method that solves the above-mentioned problems. This problem is solved by the storage device according to the present invention, which generates a pseudo sector pulse when the next sector pulse pattern is not detected.

[Effect]

In other words, in the past, if a regular sector pulse signal could not be read from the sector pulse pattern, the rereading operation was repeated multiple times after instruction control from a host device (not shown).As a solution, the sector pulse pattern When the counter that started when reading the sector pulse pattern of the sector one before the sector that could not be read shows a predetermined count value, a sector pulse reception window is created from the predetermined count value and nine pulses are generated. If no sector pulse is detected within the sector pulse reception window, a pseudo sector pulse is created at the falling edge of the sector pulse reception window and corrected and output as a regular sector pulse.

Furthermore, if the sector address of the relevant sector can be read, a storage device is provided that can correct the positional deviation of the pseudo sector pulse based on the specified time interval between the regular sector pulse pattern position and the sector address position. It is something to do.

〔Example〕

The gist of the present invention will be explained more specifically by the embodiment shown in FIG.
Explain.

FIG. 1(A) shows a pseudo sector pulse generating circuit according to the present invention, and FIG. 1(B) shows a pseudo sector pulse generating time chart according to the present invention.

In Figure 1, (5) is a pseudo sector pulse, (6) is a sector address read end pulse, ■ is a clock pulse, ■ is a preset pulse, ■ is a clear pulse, ■ is a sector pulse error signal, and ■ is a sector address d Reading end pulse, ■Beam cent signal.

■ Various read/write control signals 1m is the count value (precent value) between the normal sector pulse (2) and the pseudo sector pulse (5), and 1m' is the count value (precent value) between the normal sector pulse (2) and the sector address signal (6 ) respectively indicate the count value (precent value).

The same symbols indicate the same objects or contents throughout the figures.

FIG. 1A shows an AND circuit 1 which outputs a predetermined signal (high level) based on the AND condition that a sector pulse (2) and a sector pulse reception window (4) are being output (high level).

AND circuit 2 that outputs a predetermined signal (high level) based on the AND condition that the sector pulse (2) is at high level and the sector pulse reception window (4) is at low level.The sector pulse reception window (4) at high level is set to low level. NOT circuit 3 which converts and outputs to AND circuit 2; JK type rough flip-flop (hereinafter referred to as JK-F, F) which extracts the output signal of AND circuit 1 as a clear pulse ■ in synchronization with clock pulse ■) 4 degrees The output of the AND circuit 2 is not taken out as the sector pulse error signal ■JK=F, F
When the 5° sector pulse reception window (4) is at a high level, if a high-level clock pulse ■ is input, a D-type flip-flop (hereinafter referred to as D-F, F) outputs a pulse synchronized with the clock pulse ■ (high level). >6.7゜JK-NOT circuit 8゜D that outputs the condition that the output of F, F4 is low level to the AND circuit 11; An AND circuit that outputs a clear pulse ■ using the logic 1 degree product condition that AND circuit 1 becomes high level when the outputs of 9 degrees JK-, F, and F4 are held at low level. 10
゜Pseudo using the AND conditions of not detecting the sector pulse (2) when the sector pulse reception window (4) was at high level and that the sector pulse reception window (4) fell (became low level). Sector pulse (5)
AND circuit 11 which outputs the pseudo sector pulse (5) and the sector address read end pulse (■), and the OR circuit (12) which calculates the logical sum and outputs it as the preset pulse (■).If the pseudo sector pulse (5) is output. Select and output the preset value m stored in advance, and if the precent pulse ■ is output from the OR circuit 12, the preset value m'
Multiplexer (MPX,) that switches and outputs 1
3.

Starts with the input of a clear pulse■, then the next clear pulse■
The counter 14 restarts with the input of
Memory that outputs #green signal■ and sector pulse reception window (4) (ROM > 15° memory (ROM '
) It consists of a register 16° which temporarily stores the output of 15 and outputs it in synchronization with clock (2).

Next, the operation of this embodiment will be explained. The operation of this embodiment will be described assuming that a normal sector pulse signal (2) is initially detected from sector pattern b of a predetermined sector a.

Due to the detection of sector pulse signal (2).

A clear pulse (2) is input to the counter 14, clearing the count value up to that point, starting counting anew from the 9th clock (2), and setting a time period for receiving the first sector pulse signal (2).

When a predetermined count value is input, a memory (ROM) 15 into which the output count value of the counter 14 is always input raises a sector pulse reception window (4) signal from pre-stored counting information N and outputs it to the register 16. do. The register 16 outputs a sector pulse reception window (4) signal to the AND circuit 1 in synchronization with the clock ■.

If the sector pulse (2) is detected when the sector pulse reception window (4) signal is not raised, it is processed as a sector pulse error signal (2) by the AND circuit 2, JK-F, and F5.

When the sector pulse reception window (4) signal is input to the AND circuit 1, when the sector pulse (2) is detected, a clear pulse ■ is created by JK-F, 'F 4 and the AND circuit 10. and outputs it to the counter 14 to clear the count value.

The counter 14 starts counting, and the memory (ROM) 15 uses this count value until it is cleared. Other circuits (not shown) supply various control signals for recording/reproducing data to the data section e. Output to.

Next, the sector pulse reception window (4) is input to the AND circuit 1.
If the sector pulse (2) is not detected when the signal is being input, the condition is that the sector pulse (2) from JK-F, F4 is not detected.

D-F, F 6. Under the condition that the sector pulse reception window (4) signal from 7 has fallen, the AND circuit 11 outputs a pseudo sector pulse (5), and this pseudo sector pulse (5) is used as a precent pulse (■) to be input to the counter 1.
Output to 4.

The counter 14 starts counting to detect the next sector pulse (2) when the precent pulse ■ is input, and the memory (ROM) 15 is kept at this count value until the 9th sector pulse is cleared. Various control signals (2) for recording/reproducing data for e are output to other circuits (not shown).

Also, at this presetting time, the counter 14 enters the pre-stored precent value m and outputs the primary sector pulse (2).
Start counting for detection.

- Next, if the sector address d can be read normally after outputting the precent pulse ■, the sector address reading end pulse ■
is outputted to the counter 14 again as a preset pulse ■ via the OR circuit 12, and as a result, a regular sector pulse (
2) By selectively outputting the precent value m' from the detection position to the sector address d position using the MPXI3 and correcting the count value of the counter 14 at that time, the time setting of the primary sector pulse reception window (4) signal is set. Make sure it is set correctly.

〔Effect of the invention〕

According to the present invention as described above, even if a regular sector pulse is not detected at a regular position.

This has the effect of making it possible to efficiently record/reproduce data into the data section by making corrections using the pseudo sector pulses.

[Brief explanation of drawings]

FIG. 1(A) is a pseudo sector pulse generation circuit according to the present invention, and FIG. 1 (CB) is a pseudo sector pulse generation time chart according to the present invention. FIG. 2 is a track format on an optical disk medium. are shown respectively. In fig. 1.2, 10.11 are AND circuits, circuits. 3.8.9 is a negative circuit. 4.5 is JK-F, F, 6.7 is D-F, F. 12 is an OR circuit, and 13 is an MPX. 14 is a counter, 15 is a memory (ROM)
. 16 is a register. are shown respectively.

Claims (4)

[Claims] (1) A sector pulse pattern indicating a sector start position and a sector address are sequentially recorded in advance in a predetermined sector area on a recording medium in which a track is divided into sectors, and after detecting the sector pulse pattern, the sector address is In a device that records/reproduces predetermined data on the condition that it can be read normally, if the next sector pulse pattern is not detected within a predetermined time after a predetermined time has elapsed from the time when the sector pulse pattern was detected, a pseudo sector A storage device characterized by generating pulses. (2) A counting means is used to detect that a predetermined time has elapsed since the time when the sector pulse pattern was detected, and the sector pulse pattern is detected within a predetermined time after detecting that the predetermined time has elapsed. 2. The storage device according to claim 1, further comprising time zone setting means for detecting whether or not the current time is reached. (3) When the counting of the counting means is started with a pseudo sector pulse, the counting is started from a preset predetermined count value and the set time period for detecting the next normal sector pulse is corrected. Characteristic Claim 2
Storage device as described in section. (4) If the sector address can be read normally, the count value of the counting means that started counting with the pseudo sector pulse is changed to the pre-stored count value between the sector pulse and the sector address. 4. The storage device according to claim 2, wherein the correction is performed using a certain preset value.