JP3141842B2 - Media protection processing method for optical disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium protection processing method for an optical disk device, and more particularly, to a medium protection processing method having a function of preventing destruction of an optical disk medium.

[0002]

2. Description of the Related Art In recent years, a phase change type medium is often used as a large capacity optical disk medium. However, the phase-change type medium has a problem that the recording film is less durable than the magneto-optical disk medium, and the conventional optical disk device has a problem that the recording film is destroyed by irradiating the same track with the light beam. I have.

In a conventional optical disk device, in particular, in a magneto-optical disk device, the medium has a reproduction light resistance of 1,000,000 times or more.
Since the number of repetitions of about 10 million has been secured, the operation for the purpose of protecting the medium has not been actively performed. For example, as described in JP-A-6-150342, Therefore, the actuator is stopped for the purpose described above, and as a result, the purpose of protecting the medium is also achieved. However, the operation of stopping the actuator can also achieve the purpose of extending the life of the medium, but this conventional example aims at stopping the actuator to save power and extend the life of the device.

FIG. 4 is a flowchart showing the operation of the above-mentioned conventional optical disk apparatus in the medium protection process. The apparatus first sets a set time T that determines a trigger for executing an operation after the processing is started (step C1). Step C1 is performed at the time of device initialization immediately after the power is turned on, or is executed by a command from a switch or a host computer. Next, data write or read processing for the optical disk medium is executed (step C).
2). These processes are executed based on a write command or a read command issued from the host computer. When the data writing process and the reading process are completed, the time information t1 at the time when the process is completed is read, and
Store in a predetermined area on the memory (Step C
3). Next, it is checked whether or not there is a processing request (step C).
4). Normally, since the actuator is operating after the data write processing or the read processing, the actuator operation is not restarted (step C5) even if there is a processing request. If there is no processing request, the time information t2 is stored in the memory (step C6). T when there is no processing request
Is exceeded (step C7), the operation of the actuator is stopped (step C8). Next, when there is a processing request from the host computer with the actuator stopped, the actuator operation restart processing (step C)
5) is executed. The processing time of step C5 becomes an overhead.

[0005]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 6-1
According to the invention described in Japanese Patent No. 50342, when a command is received from the host in a state where the actuator operation is stopped, it takes time to restart the actuator operation and determine the address. There was a problem that becomes longer.

Accordingly, an object of the present invention is to solve the above problem by providing a function for seeking to a predetermined position based on the elapsed time since the last execution of the writing or reading process on the optical disk medium. Another object of the present invention is to provide a medium protection processing method having the above.

Another object of the present invention is to provide a medium protection processing method having a function of seeking to a next predetermined position based on a processing time from the time when a process of seeking to a specified position is executed. To provide.

Another object of the present invention is to provide a medium protection processing method having a function of calculating a predetermined position by calculation centering on an address at which the last write or read processing was executed.

[0009]

In order to achieve the above-mentioned object, a medium protection processing method according to the present invention comprises: A data writing / reading processing unit for controlling data writing and reading with respect to the optical disk medium to execute a command from the host computer; and a seek execution processing unit for executing processing for seeking to a predetermined position on the optical disk medium. A seek address calculation processing unit that calculates a predetermined position, and a timer processing unit that performs a time management process when performing a seek by the seek execution processing unit. At the same time, the seek address calculation processing unit determines the seek destination address based on the number of processes performed by the data write / read processing unit. The seek address is calculated by the seek address calculation processing unit, the seek execution processing unit seeks the data, and the data write / read processing unit performs the processing. It is characterized in that it is prevented from doing so.

It is preferable that the predetermined time point includes a first time point at which the writing process or the reading process is executed last.

Further, it is preferable that the predetermined time point includes a second time point at which the seek processing section seeks.

[0012]

[0013]

Further, it is preferable that the seek execution processing section sorts in the opposite direction depending on whether the number of processes is an odd number or an even number.

As described above, the medium protection processing method of the optical disk device according to the present invention has the following features. (1) A function to seek to a predetermined position based on the elapsed time from the last execution of the writing process or the reading process on the optical disc medium. (2) A function to seek to the next predetermined position based on the elapsed time from the time when the process of seeking to the predetermined position is executed. (3) A function of obtaining a predetermined position by calculation centering on the address at which the last write or read processing was executed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a medium protection processing method for an optical disk apparatus according to the present invention. This figure shows the configuration of the blocks related to the medium protection processing in the optical disk device of the present invention. The overall control unit 1 controls a data write / read processing unit 2, a seek execution processing unit 4, a timer processing unit 6, and a seek address calculation processing unit 8. The data write / read processing unit 2 is firmware that controls the data write / read circuit 3 and executes a write command or a read command from a host computer. The seek execution processing unit 4 is firmware that controls the servo circuit and the address reading circuit 5 to execute processing for seeking to a predetermined position on the medium. The timer processing unit 6 is firmware that controls the timer 7 to execute a time management process. The seek address calculation processing unit 8 is firmware that executes a process of calculating a seek destination address based on the number of processes of the present invention.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a flowchart showing the operation of the embodiment of the medium protection processing method of the optical disk device of the present invention. First, after the processing is started, the overall control unit 1 first sets a set time T that determines a trigger for executing the operation of the present invention (step A1). Step A1 is performed at the time of device initialization immediately after power-on, or is executed by a command from a switch or a host computer. Next, the overall control unit 1 uses the data write / read processing unit 2 to execute data write / read processing on the optical disk medium (step A2). These processes are executed based on a write command or a read command issued from the host computer. When the data write process and the read process are completed, the time information t1 at the time when the process is completed is read out using the timer processing unit 6, and stored in a predetermined area on the memory (step A3). Next, the presence or absence of a processing request is confirmed, and if there is a request for data write or read processing again, data write processing and read processing are executed again (step A4). Conversely, if there is no next processing request, the time information t2 at the time of confirmation is read out using the timer processing unit 6 and stored in a predetermined area on the memory (step A5). Next, the previously stored t1 and t2 are compared, and if the relationship t2−t1> T is satisfied, it is considered that a processing request has not been generated for a predetermined time or longer (step A6), and the seek address calculation processing is performed. A predetermined address is calculated using the section 8, and a seek process is performed on the predetermined address using the seek execution processing section 4 (steps A7 and A8). After executing the seek processing, the time information t1 is stored again (step A3), and the time monitoring is continued unless there is a next processing request (steps A4 to A6). When the relation of t2-t1> T is satisfied again. Then, a predetermined address is calculated again and a seek process is executed (steps A7 and A8).

The problem here is the concept of a predetermined address set when performing a seek. Therefore,
The address calculation processing flow will be described with reference to FIG.

FIG. 3 is a flowchart showing the operation of the address calculation process. The seek address calculation processing unit 8
First, a final address in a data write process or a read process is received (step B1). The receiving means may be any method such as an argument or a memory. Next, the counter value n is incremented (step B2). This counter value n needs to be set to zero when the data write processing or the read processing is executed. The counter value n is evaluated (step B3), and the processing is divided depending on whether n is an odd number or n is an even number. In addition,
The first time is odd because n = 1. Thereby, the seek of 2 * m tracks in the spiral traveling direction (steps B6 and B7) can be executed in the odd-numbered times, and the seek of m tracks (steps B4 and B5) can be executed in the reverse direction in the even-numbered times. The head moves in the spiral traveling direction by m tracks per time T. Here, m
Is a value that can be set arbitrarily.

However, recent large-capacity optical discs use a physical format that divides a data area into several tens of areas in units of bands or zones. These are MCAV (Modified Co)
ntinous Angular Velocit
y) or MCLV (Modified Conti)
Numeric Linear Velocity). In general, when the band is switched, various settings are switched, so that the overhead is large. Therefore, as a countermeasure, it is determined whether the calculated position is a band boundary (step B8). If the calculated position is a band boundary, the counter value n is returned to zero for the purpose of returning to the initial position (step B9).

[0023]

As described above, the medium protection processing method of the optical disk apparatus according to the present invention is obtained by calculation when a preset time has elapsed since the last writing or reading on the optical disk medium. A seek process to the predetermined address is performed. As a result, it is possible to avoid irradiating the same track with the reproduction light for a certain period of time or more, and to prevent the optical disc medium from being destroyed.

Further, even after seeking to a predetermined address once, when a preset time elapses, seek processing to the predetermined address calculated again is executed. Therefore, when a command is received from the host computer in this state, an effect is provided that the seek operation can be immediately executed because the actuator is operating.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation of an address calculation process.

FIG. 4 is a flowchart showing the operation of the conventional example.

[Explanation of symbols]

 1 overall control unit 2 data write / read processing unit 3 data write / read circuit 4 seek execution processing unit 5 servo circuit and address read circuit 6 timer processing unit 7 timer 8 seek address calculation processing unit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 7/085 G11B 21/08

Claims (4)

(57) [Claims] 1. A medium protection processing method for an optical disk device comprising an overall control unit for performing protection processing on an optical disk medium, wherein the overall control unit controls writing and reading of data to and from the optical disk medium, and a host computer A data write / read processing unit for executing a command of the above, a seek execution processing unit for executing a process of seeking to a predetermined position on the optical disk medium, a seek address calculation processing unit for calculating the predetermined position, and the seek execution A timer processing unit that executes a time management process when performing a seek by the processing unit, based on an elapsed time from a predetermined time by the timer processing unit, the seek address calculation processing unit,
The number of times of processing by the data write / read processing unit is
The seek destination address is calculated based on the data, and the seek execution processing unit seeks to the predetermined position calculated by the seek address calculation processing unit.
A medium protection processing method in which processing by a read processing unit is performed to prevent the same track from being irradiated with reproduction light for a predetermined time. 2. The medium protection processing method according to claim 1, wherein the predetermined time includes a first time when the write processing or the read processing is executed last. 3. The method according to claim 2, wherein the predetermined time includes a second time when the seek execution processing unit seeks.
The medium protection processing method according to claim 2. Wherein said seek execution processing unit, in the case where the even-numbered processing number is odd, and wherein a seek distributes in the opposite direction, the medium according to any one of claims 1 to 3 Protection processing method.