KR101339437B1 - Method of optical writing/reproducing and device adopting the method - Google Patents

Abstract

A method for determining the long term preservation status of data is described. In the method of the present invention, in the process of recording the information to be stored on the optical disk, the error rate at the time of recording the information is stored on the disk, and the quality of the disk is judged in comparison with the actual error rate in the future.

Description

Method of optical writing / reproducing and device adopting the method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording method and an apparatus for applying the same, and more particularly, to a method and an apparatus capable of identifying recording characteristics.

Optical Disc Drives (ODDs) are products that are specialized to shorten the recording time and have high quality reproduction characteristics. In order for the information recorded on the optical disk to be preserved for a long time without deterioration, a high quality optical disk is required, and the recording characteristics of the optical disk drive, which is a recording apparatus, must also be excellent. However, in spite of such excellent characteristics of discs and drives, it is necessary to judge whether or not the information recorded on the disc is safely stored. With the current technology, there is no special way of checking recorded information, but only by reading the information.

JP JP2007-080404 A US US2008-018620 A1

The present invention provides an optical recording / reproducing method capable of stably maintaining long-term storage data and an apparatus applying the same.

Information recording / reproducing method according to the present invention

Recording the object to be stored on the optical disc;

Measuring an initial error rate of an arbitrary recording area of the optical disc on which the storage object information is recorded;

Recording the initial error rate in any area of the optical disc;

Preserving an optical disc on which the information is recorded;

Measuring an error rate of an arbitrary recording area of the optical disc;

And determining whether the optical disc compares the measured error rate with the initial error rate stored in the optical disc.

An optical record recording / reproducing apparatus according to the present invention performs the above method.

An optical pickup for recording storage target information on the optical disk; And a circuit unit performing the above steps.

According to an embodiment of the present invention, an area in which the initial error rate is recorded is any one of a lead-in area, a lead-out area, and a data area provided in the optical disk.

The lead-in area and the lead-out area may include a reserved area, and the confirmation pattern may be recorded in the reserved area.

According to an embodiment of the present invention, the confirmation pattern may be stored in the form of a file in the data area.

According to another embodiment of the present disclosure, the recording of the confirmation pattern may be performed prior to the recording of the storage target information.

The present invention provides a method and apparatus that can easily determine the state of recording of data to be stored for a long time. Such a method and apparatus judges whether or not the data is stored on the disk by a simple method. This invention is suitable for systems that preserve large amounts of data.

1 is a schematic structural diagram of an optical disk drive according to the present invention.
2 is an information recording flowchart according to an embodiment of the present invention.
3 is a schematic plan view of an optical disk.
4 is a cross-sectional view illustrating an area of the optical disk shown in FIG. 3.
5 is a diagram illustrating an ECC block.
Fig. 6 is a flowchart illustrating the determination of whether or not an optical disk is in accordance with the present invention.

Hereinafter, an embodiment of an optical recording / reproducing method and an apparatus to which the present invention is applied will be described in detail with reference to the accompanying drawings.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

As shown in FIG. 1, an optical disk drive according to the present invention includes a disk 110, a pickup 120, a spindle motor 140, a sled motor 130, and a circuit unit 200. The circuit unit 200 includes an R / F signal processor 210, an optical driver 220, an encoder 230, a digital signal processor 210, a memory 260, a system controller 250, a servo controller 270, and a driver. 280 is provided.

Disc 110, which is a storage medium that can be used in an optical disc drive, includes a compact disc (CD), a digital versatile disc (DVD), a blue-ray disc (BD), and the like.

The pickup 120 is a means for projecting an optical signal according to the optical drive signal generated by the optical driver 140 onto the disk 110 and detecting the optical signal reflected from the disk 110.

The R / F signal processor 210 combines the signals detected by the pickup 120 to generate a focus error signal, a tracking error signal, and a signal processing signal. After the signal processing signal is normalized, the signal processing signal is converted into a binary signal and output to the digital signal processor 240.

In the recording mode, the optical driver 220 applies the recording power value determined by the optimum power control process of adjusting the recording power value and the parameter values related to the generation of the recording pulse determined by the write strategy tuning control process. The recording pulse, which is the optical drive signal, is output, and the optical drive signal for generating a constant level of laser power is output in the reproduction mode.

The encoder 230 converts the data converted into the recording format by the digital signal processor 160 into a bitstream and outputs the data to the optical driver 220.

The digital signal processing unit 240 executes signal processing for restoring the binary signal input from the R / F signal processing unit 210 to the original data with its own phase-locked clock. In the recording mode, the error correction code is input to the digital data input. (ECC) or the like is added to execute signal processing for converting to a recording format.

The servo controller 270 generates an actuator driving voltage of the pickup 120 for controlling the pickup 120 in the horizontal or vertical direction by using the tracking error signal and the focus error signal, and moves the pickup 120 to the target track. It generates a drive voltage of the sled motor 130 to move, and also generates a spindle motor control signal for controlling the disk 110 rotation speed.

The driver 200 generates a driving current for driving the spindle motor 140 and the sled motor 130 according to a control signal generated by the servo controller 190, and focuses and tracks the optical lens of the pickup 120. To generate an actuator drive current of the pickup 120 to control.

The memory 260 stores information related to write power and write strategy. The memory 260 is a nonvolatile memory and may be designed as a flash memory as an example.

Optical recording and reproducing using such an optical disc is carried out in a general manner. An optical recording method according to the present invention based on a general recording method using such a device is shown.

2 is a flowchart of an optical recording method according to an exemplary embodiment. As shown, when recording is started, the desired data, that is, the data for storage, is recorded on the disc. Subsequently, an initial error rate for determining the quality of the data for storage is recorded and then terminated. The initial error rate is detected from all or part of the area in which the storage data is recorded and is determined as the lowest error rate, the highest error rate, or the average error rate in this area.

In recording the data for storage on the optical disc, all procedures conform to the generally known standard. As shown in FIG. 3, the optical disc 110 is a disk having an inner circumference and an outer circumference, and as shown in FIG. 4, the lead-in area 111, the data (or information) area 112, It has a lead out area 113. The recording area of the initial error rate may arbitrarily select any one of the entire area of the optical disk, for example, the data area 112, the lead-in area 111, or the lead-out area 113. When the initial error rate is recorded in the data area 112, a specific pattern is recorded in a file form conforming to the file standard (ISO9660 or UDF standard) of the optical disc, and is recorded in the lead-in area 111 or the lead-out area 113. If recorded, it may be recorded in a reserved region or area not defined in the specification. If the pattern is recorded in the reserved area at this time, the initial error rate is read from this address in the step of judging whether the entire data recorded in the optical disc 10 is recorded at a predetermined address, and then After detecting the actual error rate of an arbitrary region, the error rate is compared to determine the quality of the optical disc.

 The error rate is the most widely used index that measures the quality of CD, DVD, and BD media, which are the most commonly used optical discs. The definition and specification of the error rate is different for each disk, but it is used as a quality index, so it is necessary to know the definition.

For example, when recording information on a DVD, the information is recorded in units of an ECC block (Error Correction Code block). As shown in FIG. 5, the 16 scrambled frames (2064 × 16 = 33024) are shown in FIG. 5. bytes) are arranged in an array of 192 × 172, and a 16-byte Parity Outer Code (PO) is added to each column. An ECC block is constructed by adding 10 bytes of Parity Inner Code (PI) to 192 rows of scrambled frames and 16 rows of PO and 208 rows in total (37856 bytes). In this case, the error rate refers to a difference between parity stored in each ECC block and parity generated during playback, which manages media quality by having specifications for each media. For example, in the case of DVD, the specification is defined that the sum of Parity of Inner Error (PIE) values occurring within 8 ECC-blocks must be equal to or less than 280.

According to the present invention, in managing an optical disc using such an error rate, the error rate of the area where data is recorded is recorded together with the information or data to be stored on the optical disc. The optical disc deteriorates with time, and the error rate of the area where natural data is recorded comes. The present invention detects such a change (or worsening) of the error rate and compares it with the initial error rate to determine the quality of the optical disc.

Such determination of the quality of the optical disk is made by reading the initial error rate, measuring the actual error rate of the current optical disk, and comparing these error rates.

6 is a flowchart of determining whether the optical disk according to the present invention is successful.

When judgment on the preservation of the preservation data using the optical disc drive or the dedicated device designed for the preservation of the preservation of the optical disc starts (61), the initial error rate (a) recorded when the preservation data is recorded from the optical disc on which the storage information is stored is read. (62). The actual error rate b is measured or detected from the area where the initial error rate is detected (63). Compute the difference (ba) between the initial error rate (a) and the actual array rate (b), and if the difference ba is less than a predetermined threshold, the disc is in good condition, i.e., the data recorded on the disc. After determining 66 that the condition is good, the whole process is terminated 68. If the difference b-a is larger than an arbitrarily set threshold, it is determined that the disk is in a bad state, i.e., the data recorded on the disk is damaged (67), and then the whole process is terminated (68).

In the present invention, in storing and managing data for long-term storage, the error rate at the time of data recording, that is, the initial error rate, is kept together on the disk, and the data is compared with the actual error rate in future long-term storage management. In determining the state of the optical disc, it is possible to quickly determine the state of the information stored in the optical disc by comparing the initial error rate with the actual error rate and judging the optical disc as defective if the amount of change is greater than or equal to the threshold. Conventionally, in order to confirm the data integrity of an optical disc, the original data and the data of the disc should be compared as a whole. It is a long process and it is impossible to compare it if there is no original data. However, according to the present invention, the integrity of data can be confirmed in a short time by comparing and determining the initial error rate and the actual error rate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

110: optical disc
111: lead-in area
112: data area
113; Lead-out area
120: optical pickup
130; Sled motor
140: spindle motor
200: circuit part

Claims (10)

Recording the object to be stored on the optical disc;
Measuring an initial error rate of an arbitrary recording area of the optical disc on which the storage object information is recorded;
Recording the initial error rate in any area of the optical disc;
Preserving an optical disc on which the information is recorded;
Measuring an actual error rate of an arbitrary recording area of the optical disc;
Determining whether the optical disk compares the actual error rate with the initial error rate stored in the optical disk; Optical recording / reproducing method comprising a. The method of claim 1,
And the initial error rate is recorded in a data area or a control area provided in the optical disc. 3. The method of claim 2,
And the control area includes a lead-in area and a lead-out area provided in the optical disc. The method of claim 3, wherein
And the initial error rate is recorded in the lead-in area or in the reserved area of the lead-out area in the control area. 5. The method according to any one of claims 1 to 4,
And determining whether the optical disk is good or not by comparing the amount of change in the actual error rate with respect to the initial error rate to a threshold. The method of claim 5, wherein
And the initial error rate is an average error rate of a specific area in which the storage target information is recorded. By carrying out the method according to any one of claims 1 to 4,
An optical pickup for recording a confirmation pattern on the optical disc; And
And a circuit unit for processing a signal from the optical pickup. The method of claim 7, wherein
And determining whether the optical disk is good or not by comparing the amount of change in the actual error rate against the initial error rate with a threshold. The method of claim 8,
In the step of determining whether the optical disk,
And determining whether the optical disk is good or not by comparing an amount of change of the actual error rate with respect to the initial error rate to a threshold value. The method of claim 9,
And the initial error rate is an average error rate of a specific area in which the storage target information is recorded.

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