JPS613370A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent vanishing of data by double writing, realize write protection, and make stable reproduction of data by writing a specified signal doubly in the address section of a sector recorded data of which is to be protected. CONSTITUTION:When recording dsta 12, a directory 6 determines a recordable sector and sends write address 13 being the sector address, to a comparator 7 and an address adding circuit 14. The circuit 14 adds the address 13 to the data 12, and sends out write data 15. Reproduced address 22 obtained from the address section 1 of the sector by a recording and reproducing section 10 is compared with the address 13 by a comparator 7, and when they coincide, a record trigger signal 17 is sent out. Thereby, an encoder 8 makes coding of data 15 for error control, and supplies encoded data 16 to a recording section 2. When recorded data are to be protected, the recording and reproducing section 10 makes double writing in the address section 1 and destructs address data in the address section 1 to make the address section 1 impossible to reproduce.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information recording/reproducing apparatus for recording or reproducing 1t7 information on a recording medium having an information recording area divided into a plurality of sectors. Related to optical disk file devices and magnetic disk file devices d - Conventional configurations and their problems In information recording and playback devices that record and play back information in the middle of sectors, information is recorded in the correct sector. , it must be possible to play from the correct sector. Furthermore, recorded information must be able to be reproduced.

Therefore, in conventional information recording and reproducing devices, sector addresses are confirmed by methods such as providing an address section at the beginning of a sector, or counting sector separation signals between sectors to obtain the sector address. ing. However, since the signal that generates the sector address is generally short in time, there is a problem that effective error control cannot be applied, and it is necessary to ensure sufficient reliability in the address part. As such, the address is recorded in the data recording section, which is generally more reliable than the address section of the sector, and when playing back the sector at the address indicated by the directory, the address recorded in the data recording section is A method for preventing data loss due to inability to identify sector addresses has been discovered (Japanese Patent Application No. 58-62438). However, when recording, when the address part is reproduced and compared with the sector address to be recorded, the address obtained by reproducing the address part of the recorded sector may mistakenly become the address of an unrecorded sector. There is a possibility that further data will be written to the already recorded sector. in this case,
The data in the double-written sector will be destroyed. There is a problem of data destruction due to such double writing, and a means to prevent double writing has become necessary in order to improve data reliability.

In addition, as the storage capacity of recording media increases, a single recording medium is used jointly by many users, and as device operation methods become more complex, it has become possible for other users to There has been a demand for a device that provides a means for the user to protect against loss of data due to erroneous operation of the device, or in other words, a device that has 1,000 stages of write protection.

OBJECT OF THE INVENTION The present invention solves the above-mentioned problems of the conventional technology, and is intended to prevent data loss due to double writing, realize write protection,
The purpose is to provide stable data playback. 1. Structure of the Invention The present invention provides an information recording area having a sector structure divided into a plurality of sectors, and each sector includes an address section in which an address signal is recorded in advance and a data recording section for recording data. The recording and reproducing means includes means for adding and encoding a sector address for recording this data in data to be recorded during recording, and a recording and reproducing means for recording and reproducing signals on a recording medium having The address section IC is provided with an overwriting means that overwrites a predetermined signal and makes the sector address of the address section unreproducible, and the overwriting means overwrites the predetermined signal on the address section of the sector where the recorded data is to be protected. This is an information recording and reproducing device.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a diagram showing an example of a recording format of an optical disc used in an optical disc file device in an embodiment of the present invention.

In FIG. 1, 1 is an address section, 2 is a data recording section,
3 is address mark, 4 is sector address part, 6 is CH
This is part 2. Each sector has an address part 1. The address section 1 includes an address mark 3.t, which indicates the start of the address section. Sector address section 4. If the sector address of the n-th sector is n, then the sector address n is recorded in advance in the address part 1 of the n-th sector by initial formatting etc. before recording/playback. There is.

FIG. 2 is a block diagram of an embodiment of an apparatus for recording information on an optical disk having the recording format shown in FIG. 1, and FIG. 3 shows data recorded by the recording device shown in FIG. FIG. 2 is a block diagram of a reproduction device.

In FIG. 2, 6 is a directory, 7 is a comparator, 8 is an encoder, 9 is a modulation circuit, 1° is a recording/reproducing section,
19 is an optical pink-up, 11-digit optical disc.

The directory 6 is composed of a CPU and the like, and is a circuit that determines sector addresses.

Now, when a certain data 12 is to be recorded, the directory 6 determines the recordable sector and sends the write address 13, which is the sector address, to the comparator 7. Directory 6 also sends write address 13 to address addition circuit 14 . Address addition circuit 14 adds write address 13 to data 12 and sends write data 15. A comparator 7 compares the read address 22 obtained from the address section 1 of this sector by the recording/playback section 10 and the write address 13, and sends out a recording trigger signal 17 when they match. Recording trigger signal 17
The encoder 8 that has received the data encodes the write data 15 for error control. The encoded data 16 output from the encoder 8 is then recorded in the data recording section 2.

When it is desired to protect the recorded data, the recording and reproducing section 10 sets the address section 1 so that it cannot be reproduced.
performs double writing to the address field 1 and destroys the address data in the address field.

However, if the comparator 7 does not detect a match between the playback address 22 and the write address 13, the comparator 7 (d directory 6 sends a sector undetected signal 1
Send 8. Normally, increasing numbers of sector addresses are used for consecutive sectors, so when the recording/reproducing head sequentially reads each sector address field 1 in order to search for the target sector, the reproduction address 22 changes to the write address 1.
If the recording trigger signal 17 is not generated in a trench that is larger than 3, the sector non-detection signal 18 is generated. The sector of the write address 13 at the time of receiving the directory 6-digit sector non-detection signal 18 is set as a band sector, and a new write address 13 is determined.

If the directory 6 specifies a sector that is already protected as the write address 13, the address part 1 of that sector will not be playable, and the write address 13 and playback address 22 will never match. The sector is a band sector and will never be written to again, thus protecting the data.

Note that the following method is available as an example of overwriting so that the address part 1 of the sector becomes unreproducible.

(1) Overwrite the entire address section 1 (Fig. 1a).

(2) Overwrite address mark 3 (Figure 1b).

(3) CRCR2O3 so that a CRC error occurs
Overwrite so as to make an error of less than or equal to (C) in Figure 1.

Additionally, the overwriting signal may be a DC signal or any other signal that satisfies the condition that the address of this sector cannot be read. In addition, various methods are possible for overwriting. It is.

Next, the time of reproduction will be explained. In FIG. 3, 2o is a decoder, 21 is a demodulation circuit, and 27 is an output register. When a specific sector is to be read and output, the directory 611-1' sends the address of that sector to the comparator 7 as the read address 24. The recording/reproducing unit 1o reproduces the address part 1 of the sector and performs a rough search for the target sector of the sector. Then, the reproduced data 29 obtained by reproducing the data recording section 2 of the sector near the target sector and demodulating it by the demodulation circuit 21 is sent to the decoder 2o. The decoder 20 decodes the reproduced data 29 and sends the decoded data 26 and the internal data address 28 to the output register 27 and the comparator 7, respectively.

Comparator 7 compares read address 24 and data address 28, and when they match, outputs trigger signal 2.
Roll a 6. The output trigger signal 25 causes the output I/register 7 to output the accumulated decoded data 26 as output data 2.
Output as 3. On the other hand, if the read address 24 and the data address 28 do not match in the comparator 7, the decoded data 2 stored in the output register 27
6 is ignored, and the reproduction data 29 of the next sector is taken in and the same operation is performed. In this way, it is possible to start outputting at the same time as the close search for the target sector ends.

In the optical disk file device described above, by protecting only the data to be protected and searching for the target sector by combining coarse search and fine search,
It can enable sector-by-sector write protection and high-speed search.

In this example, a search was performed using a combination of a coarse search and a fine search, but addresses were searched only by a fine search, and all address parts of sectors that had already been written were made unplayable to prevent double writing. Needless to say, it's a good thing.

According to the present invention, recording cannot be performed unless the address part is readable, and by providing means for referring to the sector address written in the data during playback and making the address part unreadable, writing to that sector is achieved. The feature is that it has a means to protect the data that has been written.

In addition, it goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

Effects of the Invention The information recording and reproducing apparatus of the present invention includes a means for adding and encoding a sector address for recording this data in the data to be recorded, and a means for overwriting a predetermined signal in the address part of the sector to encode the data. By providing a means to make the sector address of the data unplayable, it is possible to prevent data from being accidentally re-recorded in the sector that you want to protect.
Its practical value is great.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of the recording format of an optical disk used in an optical file device according to an embodiment of the present invention. T'; FIG. 2 is a block diagram showing the recording system of the optical disk file device of the same embodiment, and FIG. 3 is a block diagram showing the reproducing system of the same embodiment. 1: address section, 2: data recording section,
3...7H' reply mark, 4-...Sector address section, 5...C1 (C section, 6...Directory, 7... Comparator/-ta , 8... Encoder, 9... Change goom, 10-...
Recording and reproducing section, 11-... optical disc, 19-...
・Optical pickup, 20... Decoder, 2
1...Return 5■ circuit, 27...output register. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 figure

Claims (1)

[Claims] Recording and reproducing signals on a recording medium having a sector structure in which an information recording area is divided into a plurality of parts, and each sector has an address part in which an address signal is recorded in advance, and a data recording part for recording data. The recording and reproducing means includes a means for adding and encoding a sector address for recording this data in the data to be recorded during recording, and a means for overwriting a predetermined signal in the address part of the sector. An information recording and reproducing device comprising overwriting means for making a sector address in an address part unreproducible, the overwriting means overwriting a predetermined signal in the address part of a sector in which recorded data is to be protected.