JPS607652A - Information recording system - Google Patents

Abstract

PURPOSE:To shorten an information testing time by recording data in two areas on an unwritable medium such as an optical disc. CONSTITUTION:The 1st area writing data in one sector at the unit of plural records and the 2nd area writing data in one sector in each record are formed on an unwritable recording medium. At the writing of information, records are written in the 2nd area at first. When the sum of the number of written records and the number of records in the 2nd area succeeding to the newest record of the 1st area reaches the writing unit of the 1st area, both the records in the 2nd area in which residual records which are not written in the 1st area are recorded is recorded. Thus, the information testing time can be shortened.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an information recording method, and in particular, to a non-rewritable medium such as an optical disk, record recording is performed in two areas, thereby reducing information inspection time. The present invention relates to an information recording method that can be shortened.

[Background of the invention]

In recent years, optical disk devices using laser light have been developed as large-capacity information storage devices. This optical disk device uses a rotating disk (optical disk) with a metal film on its surface as a medium, and forms pits (holes) on the metal film by irradiating it with light that is modulated according to information. Information is written, irradiated with a weak laser beam that does not melt the metal film, and the presence or absence of pits is determined based on the strength of the reflected light, thereby reading the information. Furthermore, it is impossible to rewrite information on an optical disk medium in an area in which information has once been recorded.

On the surface of an optical disk, for example, 1024 tracks are provided on one side in a concentric or continuous spiral pattern, and each track is divided into a plurality of blocks (sectors). Conventionally, a method has been adopted in which records are recorded one by one in each sector on a track, regardless of whether it is a single record or multiple records.

In addition, as a known recording method, a method called a blocking method in magnetic recording has been proposed (I B
M Product ReferenaeLit, 5
rature TheI B M Dioksto
G@nera/ Information Manu
a/! .

(See pages 24-27).

In this method, as shown in FIG. 1, a plurality of records 2 are recorded within one sector l on a track.

That is, in FIG. 1, there are 4-
Records 2 are recorded. On a rewritable recording medium such as a magnetic disk, when recording successive records one by one, read the recorded records in a sector and add the records you want to record in that sector. It is possible to record in sector units. In this case, for the check code recorded in each sector, the check code may be recalculated using new record data and an updated value may be recorded at the same position.

On the other hand, in non-rewritable recording media such as optical discs, even if you try to insert a new record in a sector, it is difficult to align the recording position next to the recorded record in the sector. In addition, since the recorded information cannot be rewritten, the check code cannot be updated or additionally written.

For this reason, in a non-rewritable recording medium, records that are generated sequentially are recorded in one sector in one code. Therefore, when searching for a record, as the number of sectors increases, the time required to read the record also increases. For example, if the sector length is 512 bytes and the record length is 50 bytes, in the case of a magnetic disk, 10 record WiFi can be performed in one sector, but in the case of an optical disk, each of the 10 sectors It is necessary to record one code per sector, and the number of sectors must be 10.
This results in a difference of about 10 times, which not only results in wasted use of area, but also in search time.

[Object of the Invention] The object of the present invention is to improve such conventional drawbacks, and to provide an information record that can significantly reduce the search time when searching for information recorded on a non-rewritable recording medium number J. The goal is to provide a method.

[Summary of the invention]

In order to achieve the above object, the information recording method of the present invention is based on a non-rewritable recording medium, in which multiple data are recorded in one sector.
Set up an area for writing data in units of 1 and a second area for writing data in code units in 1 sector, and when writing information, first write a record to the second area, and then write the data to the second area. When the sum of the number of records in the first area and the number of consecutive records in the second area reaches the writing unit of the first area, both records in the second area are transferred to the first area. The feature is that the position of the second area in which the fractional record written in the area and not written in the first area is recorded is recorded.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

2 to 5 are diagrams for explaining the present invention in detail.

FIG. 2 is a diagram showing areas of blocked sectors and original sectors.

Mid) rack from the outside to the inside of multiple tracks provided on an optical disc. , track l,...
・Add the track number. In FIG. 2, only some of these tracks are shown.

3 is the label sector area, ヰ is the blocked sector area.
The convex area is the original sector area, 6 is the label sector, 7 is the blocked sector, and 8 is the original sector.

In the present invention, when recording a record on a non-rewritable recording medium such as an optical disk, the record recording area on the medium is set in advance to an area 5 in which one record is recorded in one sector, as shown in FIG. Divide the area to record multiple records in l sector. Hereinafter, in this specification, each sector of area δ in which l records are recorded in one sector will be referred to as an original sector 8, and each sector in area Φ in which multiple records are recorded in one sector will be referred to as blocked sector 7. I'll decide.

In FIG. 2, in addition to these area numbers 5, a label sector area γ3 starting from track 0 is shown.

Each label sector 6 belonging to label sector area 3
contains blocked sector 7 and original sector 8.
Pointer information of the area, information indicating the size of each area, etc. are recorded.

Each sector described above has its own unique address number; in the example of FIG. 2, label sector 6 is labeled L-1;
The blocked sector 7 is represented by B-1, B-2°, . . . , and the original sector 8 is represented by O-1, 0-2°, . . . .

FIG. 3 is a detailed view of the blocked sector 7, and FIG. 4 is a detailed view of the original sector 8.

The blocked sector 7 includes a plurality of records 2, as shown in FIG.
This shows a case where 2 records are recorded.

Original sector 8 contains G, 1 as shown in Figure 4.
Two records 2 are recorded.

FIG. 5 shows a state in which, for example, 14 records are recorded by using the blocked sector 7 and the original sector 8 as described above.

Assuming that the recorded record numbers are from O-1 to 0-14, of these 14 records 2, 12 records from 0-1 to 0-12 are recorded in the original sector 8 for each l record. ° as well as (not shown)
, four records each are recorded in the blocked sector 7, and the remaining two records are recorded only in the original sector 81e. That is, 0-1 to 0-4 is assigned to the blocked sector (B-1) in FIG. 5, and 0-5 is assigned to (B-2).
~〇-8 and (B-3) respectively record 0-9 to 0-12, and pointer 9 of the final blocked sector (B-3) contains the first fraction that could not be recorded in the blocked sector. The original sector where the record is recorded (0-1
3) address is recorded.

In this way, when reading, by first accessing blocked sector area 4, most consecutive records can be read from a small number of sectors, and only the fractional records following the last record recorded in the area are read. Original sector area 5 to l record/1
It is easy to read sectors one by one. As in the past, one sector is
When records are recorded one by one, it takes time to read out the #2 search code, but in the present invention, since a plurality of search codes can be recorded in one sector, the time required to read the first search code can be shortened.

FIG. 6 is a schematic diagram of an optical disk control device that implements the above-described recording method, and FIG. 7 is a detailed block diagram of FIG. 6.

An optical disk control device that controls information recording and reading on an optical disk is composed of a processing device 20, a buffer 21, and an access mechanism 22, as shown in FIG. The processing device 20 controls the optical disk 23 and processes data, the buffer 21 temporarily stores data recorded on the optical disk 23 and data read from the optical disk 23, and the access mechanism 22 controls lq of the processing device 420.
The positioning of the optical disc 23 and the reading and writing of the optical disc 23 are controlled by the command.

As shown in FIG. 7, the processing device 20 includes four microbe processors 24. Memory 25. Interface controller 2
6, and a selector 27, and an access mechanism 2
2 is a write circuit 28. Reading circuit 29 and optical head circuit 3
Contains 0. The interface controller 26 is a CP
The microprocessor 24 controls signal transmission and reception with a host device such as a U channel, and operates each IQ component of the optical disk control device according to a predetermined procedure in accordance with commands from the host device. stores microinstructions that define control operations by microprocessor 24. The write circuit 28 also modulates the data taken out from the buffer memory 21 and outputs it to the optical head circuit 30.
The reading circuit 29 receives the output signal 30 from the optical head circuit 30.
is demodulated and transferred to the buffer memory 21. The selector 27 selects the input/output bus of the buffer memory 21 and selects the interface bus signal 31 according to a microinstruction 34 given from the microprocessor 24.
The processor bus signal 33 and the R/W circuit bus signal 32 are selectively connected to the buffer memory 21.

Prior to writing (71) + writing, the buffer memory 21 stores the fractional records read from the original sector area 5 and the additional records to be newly recorded given from the host device in the blocked sector. Number of writing units (
In the example of FIG. 3 and FIG.

FIG. 8 shows an example of a program 70-chart that the microprocessor 24 executes during a record write operation, and FIG. 9 shows an example of a program 70-chart that the microprocessor 24 executes during a search operation. There is.

When writing a record, as shown in Figure 8, the first slash sector is read to find out the starting position of the blocked sector (step 41), and the latest blocked sector is searched sequentially from the starting address to find the contents. Read h (step 42). Then, based on the pointer to the original sector of the fractional record following the latest blocked sector, the original sectors are sequentially read and stored in these fractional record buffers (step 43).

If a blocked sector is not recorded, the original sector is read based on the starting position of the original sector recorded in the label sector. A record is loaded from the sector following the latest original sector (step 44).

By adding records to the original sector area,
If the fractional record in the original sector area is greater than or equal to the unit of writing to the blocked sector (step 4)
5) Add a predetermined number of units from the beginning of the fractional records to the blocked sector area, and add address information indicating the beginning of the fractional records left in the original sector area to the latest blocked sector. Write it down (step 46).

In step 45, if the number of records to be written to the blocked sector does not reach l1ll, that is, if only the original sector is sufficient, the write operation is completed when the records have been written to the original sector.

In other words, add the number of records in the original sector following the latest record, m, and the number of records to be written this time, l.
j+m (If n, write l records sequentially following the latest record in the original sector, l+m+) If n, write n records at a time after writing to the original sector, including m records up to the previous time. Block.

When performing a record search, as shown in FIG. 9, first the label sector is read (step 51), the leading position of the blocked sector is detected, and the blocked sectors are sequentially read from there (step 52).

Read blocked sectors until the desired record is found. Encounter C where the target record is not found (step 53
), referring to the pointer to the fractional original sector recorded in the latest blocked sector (step 54
), read the original sector (step 55),
Il the original sector until the target record is found.
[+:jth read.

When it is detected that it is the latest original sector (step 57), an error code indicating that there is no target record is set and the process ends (step 58).

Note that in Step 5], if the blocked sector is not recorded, the original sector is accessed using the pointer recorded in the label sector, just as in the case of a write operation, and the block sector is accessed in step 5]. Proceed to step 55.

In the above practical example, a case has been described in which recording is performed one record at a time, but the control of the microprocessor 24 can also be made to process a plurality of records at a time. In this case, when recording multiple blocked sectors at once, the original
It is also possible to omit the pointer to the sector. Furthermore, in the embodiment, the original sector is recorded in units of 1 record, but it may be recorded in units of multiple records. In addition, in the embodiment, a record is first written to the original sector, and the sum of the number of written records and the number of records of the original sector specified in the latest blocked sector is the number of records written in the blocked sector. When the number of units (four in the example in Figure 5) is reached, both records are written to the sector next to the latest blocked sector, so in the end all identical records are duplicated in both the original sector and the blocked sector. However, in another embodiment, records that can be written to a blocked sector are written to a blocked sector to avoid duplication, and records that can be written to a blocked sector are For example, from the state shown in Figure 5, 5 records (0-15) ~ (0-19
), write (0-15), (0-16) along with (0-13), (0-14) of the original sector,
It is recorded in the blocked sector (B-4), and in the original sector area (0-14), then (0-17) to (
0-19) are recorded. In this case, records (0-17) to (019) (7) 3:
It is also possible to collectively record I-)- in sectors (0-15).

Currently, when recording a search code to be added to image data in an image file using an optical disk, if one search code is recorded in one sector, it takes time to read the search code, but with the present invention, it takes time to read the search code. Since multiple search codes are recorded, the time required to read the search code can be shortened.

For example, if the sector length is 512 bytes and the search code is 50 bytes, it will be possible to record 1° record in the blocked sector, and in the records of 10,000 search foods, the original sector will be 10,000 sectors,
Blocked sector is 1oo.

Sector is required. In this case, the number of sectors is 10% compared to the conventional method (10,000 original sectors).
Although the time required to read a sector to search for a target record is approximately 1/10 of that of the conventional method, it is possible to increase the search speed by 10 times. Also, the same record
rI! Since information is recorded twice in the original sector area and the blocked sector area, a backup function is also provided.

〔Effect of the invention〕

As described above, according to the present invention, when information is recorded on a non-rewritable recording medium, a multi-search code is recorded in one sector, so the time required to read the search code can be significantly reduced. Therefore, if applied to a ti''3i image file device using an optical disk or the like, the effect will be extremely large.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of how to record blocked records, Figure 2
5 to 5 are diagrams showing the relationship between blocked sectors and original sectors for detailed explanation of the present invention, FIG. 6 is a schematic diagram of an optical disk control device showing an embodiment of the present invention, and FIG. Figure 7 is a detailed block diagram of Figure 6, η):
8 and 9 are flowcharts of a record writing operation and a record searching operation, respectively, showing an embodiment of the present invention. 21: x7a memory, 2ox: microprocessor,
25: memory, 26: interface controller,
27: Selector, 284S included circuit, 29: Reading circuit, 3
0: Optical head circuit. Patent applicant: Hitachi Chemical Co., Ltd.ノ(・Hosoiri, (IIMj7+-67 ships village@&ko-
-Figure 1 Figure 3 Cow Figure 2 Figure 7 Figure 8

Claims (1)

[Claims] (1) A first area and a second area are set on a recording medium having vlI number of tracks each consisting of a plurality of sectors, and the first area has data of l records per sector. is recorded in the second area, including each record in the first area except for fractional records, and records data in the form of scattered records per sector.
An information recording method characterized in that information indicating the leading position of the fractional record is recorded in the latest recording sector of the area. e) In the information recording method according to claim 1, data to be recorded at an accelerated rate is recorded in one sector by l records following the fractional records in the first area, and these fractional records and additional records are recorded. When the total number of records exceeds a predetermined number, data is recorded in the second area in groups of records starting from the beginning of the fractional records. (3) In the information recording method described in claim 1, when the total of the fractional records in the first area and the number of records of data to be additionally recorded exceeds a predetermined number, the fractional records are placed at the top. The information recording method is characterized in that data is recorded in the second area in batches of a plurality of records, and a new fractional record that is not recorded in the second area is recorded in the fI\1 area.