JP2001176186A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the bringing out of the performance automatically in recording and reproducing operation even though the reproducing speed is not set from a host computer. SOLUTION: By a system controller 15, the control is executed so that the recording speed when recording data spirally or concentrically on an optical disk 20 and the reproducing speed when reproducing the data recorded on the optical disk are made different, and also the reproducing speed right after the data recording to the optical disk 20 is controlled so as to be the same as the recording speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus such as a CD-R / RW apparatus capable of setting different speeds for recording and reproducing data on a recording medium.

[0002]

2. Description of the Related Art A data recording / reproducing apparatus for a disk-shaped storage device (disk) such as an HDD, an FDD, and an MO divides a storage area into a plurality of areas in order to increase the storage capacity of the disk, and records / reproduces a bit rate for each area. However, recording and reproduction are basically performed at the same bit rate for the same sector.

[0003] This was developed on the premise of recording and reproduction by itself, and changing the rotation speed of the spindle motor to change the bit rate of recording and reproduction naturally causes a serious decrease in access performance. It can be said.

[0004] In recent years, a CD-R / RW drive has received a great deal of attention as a storage device because of its high compatibility with a CD-ROM drive that is standardly mounted on a personal computer (PC). As a result of fierce competition in the development of CD-ROM drives, the playback speed has become extremely high, and CAV playback has become commonplace.

[0005] On the other hand, CD-R / RW drives are still under development, and although recording speed has been gradually increased, there is a gap from the reproduction speed, and above all, CAV recording has not been put to practical use. That is, in the CD-R / RW drive, if the current recording / reproducing speed is to be the same, the reproducing speed must be reduced to the recording speed.

However, considering only reproduction, the higher the speed, the better the performance, and the current CD-R / RW drive necessarily has a specification that the reproduction speed is faster than the recording speed.

A CD-R is a medium on which recording can be performed only once. Since information is recorded by additional recording, the need to reproduce information recorded in the past is low, and a reproduction operation enters during a series of recording operations. Less is.

However, the CD-RW can be overwritten, and the R / RW drive performs random recording and reproduction on a block called a packet on the CD-RW. In other words, the CD-R / RW drive can be used as a random block access device capable of recording and reproducing in the same manner as the MO if the CD-RW is used.

However, the problem here is the difference between the recording speed and the reproduction speed. When the random block access is performed, rewriting to existing information occurs, and it is inevitable to avoid a certain amount of reproducing operation during a recording operation.

In a CD-R / RW drive, if the recording speed and the reproducing speed are the same, only an access time for moving the head is required, but if the recording speed and the reproducing speed are different, the spindle motor needs to be shifted. This shift requires many times as much time as the head movement, and greatly increases the access time.

That is, the recording / reproducing performance is significantly reduced. This decrease in recording / reproducing performance becomes more remarkable as the difference between the recording speed and the reproducing speed increases. Generally, it is preferable to make the recording speed and the reproduction speed the same in order to minimize the decrease in the performance of the recording and reproduction.

Conventionally, most CD-R / RW drives are
A setting is provided to enable reproduction at the same speed as recording, and the recording speed and reproduction speed can be made the same by setting from the host computer.

[0013]

However, in the conventional CD-R / RW drive, the currently mainstream CD-RW driver software does not have a specification for dynamically changing the regeneration speed. There is a problem that it is not possible to reproduce the CD-ROM at the maximum speed and to reproduce the CD-RW at the maximum speed unless recording is performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the recording and reproducing performance can be improved by appropriately controlling the reproducing speed during recording and during reproduction even if the reproduction speed is not set by the host computer. The purpose is to be able to draw out to the maximum.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a recording medium for recording data spirally or concentrically on a recording medium and a method for reproducing data recorded on the recording medium. In the data recording / reproducing apparatus provided with control means for making the reproduction speed different, the control means is provided with means for controlling the reproduction speed immediately after recording data on the recording medium to be the same as the recording speed.

A data recording / reproducing device comprising a control means for increasing a reproducing speed when reproducing data recorded on the recording medium, faster than a recording speed when recording data spirally or concentrically on the recording medium. In the apparatus, the control means may be provided with means for controlling a reproduction speed immediately after data recording on the recording medium to a constant speed irrespective of an externally specified reproduction speed specified by a host computer.

Further, in the data recording / reproducing apparatus as described above, it is preferable that the control means is provided with a means for maintaining a reproduction speed immediately after the data recording for a predetermined time and thereafter reproducing at a reproduction speed specified by a host computer. .

Further, in the data recording / reproducing apparatus as described above, the control means keeps the reproducing speed immediately after the data recording until a predetermined number of commands are counted, and thereafter reproduces the data at a preset reproducing speed. Means may be provided.

[0019]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disk drive according to an embodiment of the present invention.

This optical disk drive comprises a spindle motor 1, a motor driver 2, a servo processing unit 3, an optical pickup 4, a read amplifier 5, a CD decoder 6, a CD-R
OM decoder 7, memory manager 8, memory 9, host interface (I / F) 10, CD encoder 1
1, CD-ROM encoder 12, ATIP decoder 1
3, LD driver 14, and system controller 15
Etc.

The system controller 15 is a microcomputer including a CPU and the like. The system controller 15 is connected to the other main parts through control signal lines and data signal lines (not shown), and controls the respective parts to control the optical disk. Controls the entire drive.

Optical disk 2 is driven by spindle motor 1
Then, the motor driver 2 and the servo processing unit 3 control the spindle motor 1 so that the linear velocity becomes constant. This linear velocity can be changed stepwise.

The motor driver 2 and the servo processing unit 3
Controls a focus actuator, a track actuator, and a seek motor based on signals obtained from a light receiving element and a position sensor, and controls a laser beam spot to be located at a target location on the optical disc 20.

The optical pickup 4 incorporates a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element, and a position sensor (not shown), and includes a CD-ROM, a CD-R, and a CD-R.
The optical disk 20 such as W is irradiated with laser light.

When data on the optical disk 20 is read, the reproduced signal obtained by the optical pickup 4 is amplified by the read amplifier 5 and binarized, and then input to the CD decoder 6 for deinterleaving and error correction. Receive processing. The data is input to the CD-ROM decoder 7,
Further, the data undergoes error correction processing in order to improve the reliability of the data.

Thereafter, the data is temporarily stored in a memory (buffer RAM) 9 by a memory manager (buffer manager) 8, and when the data is prepared as sector data, the data is transferred to a host via a host interface (I / F) 10 such as ATAPI or SCSI. Sent to the computer at once.

On the other hand, when writing data on the optical disk 20, data sent from the host computer via the host I / F 10 is temporarily stored in the memory 9 by the memory manager 8.

Writing is started when a certain amount of data is stored in the memory 9. Before that, the spot of the laser beam must be positioned at the writing start point on the optical disk 20.

The write start point is determined by the optical disk 20
It is obtained from a wobble signal based on the wobble previously engraved by the meandering of the track. The wobble signal contains absolute time information called ATIP,
The ATIP decoder 13 can extract absolute time information. Further, a synchronization signal generated by the ATIP decoder 13 is input to the CD encoder 11, and enables writing of data at an accurate position.

The data in the memory 9 is added with an error correction code and interleaved by a CD-ROM encoder 12 or a CD encoder 11 and recorded on an optical disk 20 via an LD driver (laser control circuit) 14 and an optical pickup 4. You.

The read speed and the write speed have several settings, and the maximum read speed can be set to be sufficiently higher than the maximum rate. The speed can be individually specified from the host computer.

FIG. 2 is a table showing an example of the time required for write processing when the recording speed and the reproduction speed are the same and different. In this list, when the write speed (recording speed) and the read speed (reproduction speed) are the same or different, when writing a file, such as when copying a file,
It simply shows that there is a big difference in execution time.

FIG. 3 is a graph based on the numerical values shown in FIG. 2. In FIG. 3, the vertical axis represents the accumulation of the read / write data, and the horizontal axis represents the elapsed time.
1 indicates a change in the speed 1, and a broken line L2 indicated by a solid line indicates a change in the speed 2.

Normally, when the OS writes a file, instead of simply writing the file, the management information of the file is read, and the writing and reading are alternately repeated although the writing ratio is high. .

Therefore, the table of FIG. 2 shows that the time for writing, reading, writing, reading, and writing 1800 KB data for one write and 600 KB for read is the same for write and read. Numerical values are obtained in the case of double speed 1 and in the case of write 4 × speed but read 8 × speed 2.

When the calculation is performed only by the data transfer rate without the command overhead, the quadruple speed is 600 KB.
/ S, 8x speed is 1200 KB / S, speed 1 is 11 seconds, and speed 2 is 14 seconds. However, at the speed 2, the time required for the spindle motor 1 to shift from 4 × to 8 × and from 8 × to 4 × is set to 1 second.

It is clear that if the amount of read data between writes is small, the benefit of high-speed read cannot be obtained.
This means that the effect of time loss due to shifting is very large.

The branch point of whether the speed 1 is good or the speed 2 is good is 2400 KB in read data amount.
There is almost no case in which such a large amount of data is read by ordinary reading between writes, and a large shift in the current OS and driver leads to a decrease in performance.

Next, functions and processes of the optical disk drive according to the present embodiment, which are described in the claims of the present invention, will be described.

(1) Function and processing according to the first aspect of the present invention Here, the system controller 15 or the like of the optical disk drive determines the recording speed when recording data spirally or concentrically on a recording medium. Control means for varying the reproduction speed when reproducing the data recorded on the recording medium,
It functions as means for controlling the reproduction speed immediately after recording data on the recording medium to be the same as the recording speed.

FIG. 4 is a flow chart showing the processing contents according to claim 1 of the present invention in the optical disk drive shown in FIG. In this process, it is determined in step (indicated by "S" in the figure) 1 whether or not a command is received, and if not, the process of step 1 is repeated.
If a command is received, the process proceeds to step 2 to determine whether or not the command is a write command.
If it is not a write command, go to step 6.

In step 3, the write speed specified by the host computer is set, the flow advances to step 4 to execute the write processing, and the flow advances to step 5 to set the write flag to "1" and returns to the first processing.

In step 6, it is determined whether or not the command is a read command. If the command is a read command, the process proceeds to step 7 to determine whether or not the write flag is "1". Set the same read speed as the write speed, and proceed to step 9 to set the write flag to “0”.
, The process proceeds to step 10 to execute the read process, and returns to the initial process.

The write flag is "1" in the judgment of step 7
If not, the flow advances to step 11 to set the read speed specified by the host computer, and the flow advances to step 10 to execute a read process, and returns to the first process. If it is not a read command in step 6, the process proceeds to step 12 to execute processing of other corresponding commands, and returns to the initial processing.

This processing will be further described. When receiving the write command, the system controller 15 sets the write speed specified by the host computer, performs the write process, and sets the write flag to “1” after the write process.

The write flag is a value used to determine whether or not a read command is preceded by a write command. When the write flag is "1", the same read speed as the immediately preceding write speed is set and read is performed. Perform processing. Then, after the read processing, the write flag is set to “0”.

When the read command is received, if the write flag is not "1", the read processing is performed by setting the read speed specified by the host computer. By performing such operation processing, high read / write performance can be obtained.

As described above, even when the write speed and the read speed specified by the host computer are largely different from each other, the performance is not remarkably reduced when the write and the read are repeated.

(2) Function and processing according to the second aspect of the present invention Next, in the optical disk drive, when the write speed is as slow as 1x or 2x and the spindle motor 1 has a sufficient torque, In a high speed band, it may be better to perform reading between writes at a fixed speed with a slightly increased speed instead of at the writing speed.

Therefore, the system controller 15 or the like of the optical disk drive sets the reproduction speed for reproducing the data recorded on the recording medium to be lower than the recording speed for recording the data spirally or concentrically on the recording medium. The function of the control means for increasing the speed and the function of controlling the reproduction speed immediately after data recording on the recording medium to a constant speed regardless of the reproduction speed externally designated by the host computer may be fulfilled.

FIG. 5 is a flow chart showing the processing contents according to the second aspect of the present invention in the optical disk drive shown in FIG. The operation process shown in FIG. 5 is changed from the process of setting the same read speed as the immediately preceding write speed shown in FIG. 4 to the process of setting a fixed read speed.

In this process, it is determined in step (indicated by "S" in the figure) 21 whether or not a command has been received. If the command has not been received, the process in step 21 is repeated. It is determined whether or not the command is a command. If the command is a write command, the process proceeds to step 23;

In step 23, the write speed specified by the host computer is set, the flow advances to step 24 to execute the write processing, and the flow advances to step 25 to set the write flag to "1" and returns to the first processing.

In step 26, it is determined whether or not the command is a read command. If the command is a read command, the process proceeds to step 27 to determine whether or not the write flag is "1". If the write flag is "1", the process proceeds to step 28 to perform fixed read. The speed is set, the flow proceeds to step 29, the write flag is set to "0", the flow proceeds to step 30, the read processing is executed, and the processing returns to the first processing.

If the write flag is not "1" in step 27, the flow advances to step 31 to set the read speed specified by the host computer.
The process proceeds to 0 to execute a read process, and returns to the first process. If the read command is not the read command in step 26,
Proceeding to step 32, execute the processing of the other relevant commands, and return to the initial processing.

In this way, when the write processing is performed at a low speed and the amount of read data is large, the effect of improving the performance is enhanced.

(3) Function and processing according to the third aspect of the present invention In the above-mentioned operation processing, a read command between writes is assumed to be once, but in operation processing such as actual file copy, small blocks are read. A read command is issued multiple times. Therefore, in the above-described operation processing, there is a possibility that the speed is shifted to the read speed designated by the host computer, and the effect is almost lost.

Therefore, it is preferable that the system controller 15 or the like of the optical disk drive keeps the reproduction speed immediately after data recording for a predetermined period of time, and then performs the function of a means for reproducing at the reproduction speed specified by the host computer.

FIG. 6 is a flow chart showing the processing contents according to claim 3 of the present invention in the optical disk drive shown in FIG.

In this processing, the read command between writes is performed at the same read speed as the immediately preceding write speed for a fixed time (for example, 10 seconds), and when the read command is exceeded, the read speed specified by the host computer is set. The predetermined time may be determined based on the result of comprehensively determining the operation of the OS and the performance, operation feeling, and performance of the optical disk drive.

In this processing, it is determined in step (indicated by "S" in the figure) 41 whether or not one second has elapsed. If one second has elapsed, the process proceeds to step 47, and if the write timer is not "0", the write timer Is subtracted, and the process proceeds to step 42, and before one second has elapsed, the process proceeds to step 42 to determine whether or not a command has been received.

If it is determined in step 42 that the command has not been received, the process returns to step 41. If the command has been received, the process proceeds to step 43 to determine whether or not the command is a write command. Go to step 48.

In step 44, the write speed specified by the host computer is set, and the flow advances to step 45 to execute the write processing. The flow advances to step 46 to set the write timer to "10" and returns to the initial processing.

In step 48, it is determined whether or not the command is a read command. If the command is a read command, the process proceeds to step 49 to determine whether or not the write timer is "0". If the write flag is not "0", the process proceeds to step 50. The same read speed as the immediately preceding write speed is set, the process proceeds to step 51, where the read process is executed, and the process returns to the initial process.

If it is determined in step 49 that the write timer is "0", the flow advances to step 52 to set a read speed specified by the host computer, and the flow advances to step 51 to execute a read process, and returns to the first process. If the command is not a read command in step 48, the flow advances to step 53 to execute the processing of other corresponding commands, and returns to the initial processing.

As described above, when the write speed and the read speed specified by the host computer are largely different from each other, the performance is not remarkably deteriorated even if the file is copied using the OS. Further, the user does not need to change the read speed each time the use of the optical disk drive is performed for the read purpose or the write purpose, so that the operability can be improved.

(4) Function and processing according to the fourth aspect of the present invention It is quite effective to determine the speed change point in a fixed time as in the above-described operation processing. Incorporating the timing function complicates the program and increases the code size of the program.

Therefore, the system controller 15 of the optical disk drive or the like keeps the reproduction speed immediately after data recording until a predetermined number of commands are counted, and then performs the function of a means for reproducing at a preset reproduction speed. Good.

FIG. 7 is a flow chart showing processing contents according to claim 4 of the present invention in the optical disk drive shown in FIG. In this processing, the number of read commands is counted as a method of determining the speed change point more simply than the above processing.

The number of times of the command is “0” after the write processing.
, And incremented when the read processing is performed.
If the command count is less than the specified value, the read speed is set to the same read speed as the immediately preceding write speed, and when the command speed is exceeded, the read speed specified by the host is set.

In this process, it is determined in step (indicated by "S" in the figure) 61 whether or not a command has been received. If no command has been received, the process in step 61 is repeated. It is determined whether the command is a command. If the command is a write command, the process proceeds to step 63; otherwise, the process proceeds to step 66.

In step 63, the write speed specified by the host computer is set, the flow advances to step 64 to execute the write processing, the flow advances to step 65, the number of commands is set to "0", and the flow returns to the initial processing.

In step 66, it is determined whether or not the command is a read command. If the command is a read command, the flow advances to step 67 to determine whether or not the number of commands is smaller than a predetermined value. The same read speed as the write speed is set, the process proceeds to step 69 to execute the read process, the process proceeds to step 70, "1" is added to the number of commands, and the process returns to the first process.

If the number of commands is equal to or greater than the specified value as determined in step 67, the flow advances to step 71 to set the read speed designated by the host computer. The flow advances to step 69 to execute the read process. "1" is added to the number of times, and the process returns to the first processing. Also,
If the command is not a read command in step 66, the flow advances to step 72 to execute processing of other relevant commands, and returns to the initial processing.

In this way, even when the write speed and the read speed specified by the host computer are significantly different, the performance is not significantly reduced when writing and reading are repeated, and the program can be easily changed. In addition, a great effect can be obtained, and the code size of the program can be reduced.

[0076]

As described above, according to the data recording / reproducing apparatus of the present invention, the recording and reproducing performance can be automatically maximized even if the reproducing speed is not set by the host computer. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disk drive according to an embodiment of the present invention.

FIG. 2 is a table showing an example of a required time of a write process when a recording speed and a reproduction speed are the same and different.

FIG. 3 is a graph based on the numerical values shown in FIG. 2;

FIG. 4 is a flowchart showing processing contents according to claim 1 of the present invention in the optical disk drive shown in FIG. 1;

FIG. 5 is a flowchart showing processing contents according to claim 2 of the present invention in the optical disk drive shown in FIG. 1;

FIG. 6 is a flowchart showing processing contents according to claim 3 of the present invention in the optical disk drive shown in FIG. 1;

FIG. 7 is a flowchart showing processing contents according to claim 4 of the present invention in the optical disk drive shown in FIG. 1;

[Explanation of symbols]

 1: spindle motor 2: motor driver 3: servo processing unit 4: optical pickup 5: read amplifier 6: CD decoder 7: CD-ROM decoder 8: memory manager 9: memory 10: host I / F 11: CD encoder 12: CD-ROM encoder 13: ATIP decoder 14: LD driver 15: System controller 20: Optical disk

Claims (4)

[Claims] 1. A data recording / reproducing apparatus comprising a control means for making a recording speed for recording data spirally or concentrically on a recording medium different from a reproducing speed for reproducing data recorded on the recording medium. 2. The data recording / reproducing apparatus according to claim 1, wherein the control means includes means for controlling the reproduction speed immediately after recording the data on the recording medium to be equal to the recording speed. 2. A data recording / reproducing device comprising: a control unit for increasing a reproduction speed when reproducing data recorded on a recording medium, in comparison with a recording speed when recording data spirally or concentrically on the recording medium. In the apparatus, the control means may include means for controlling a reproduction speed immediately after data recording on the recording medium to a constant speed regardless of a reproduction speed specified by an external host computer. Playback device. 3. The data recording / reproducing apparatus according to claim 1, wherein said control means includes means for maintaining a reproduction speed immediately after said data recording for a predetermined time, and thereafter reproducing at a reproduction speed designated by a host computer. A data recording / reproducing device provided. 4. The data recording / reproducing apparatus according to claim 1, wherein the control means keeps a reproduction speed immediately after the data recording until a predetermined number of commands are counted, and thereafter keeps the reproduction speed at a preset reproduction speed. A data recording / reproducing apparatus, comprising: means for reproducing.