JP3708388B2 - Data recording / reproducing device - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
A data recording / reproducing apparatus of a disk-like storage device (disk) such as HDD, FDD, MO, etc. cannot divide the storage area into a plurality of areas and change the recording / reproduction bit rate in each area in order to increase the storage capacity of the disk. Even in this case, recording and reproduction are basically performed on the same sector at the same bit rate.
[0003]
This can be said to have been developed on the premise of self recording and reproduction, and changing the rotation speed of the spindle motor in order to change the bit rate of recording and reproduction causes a serious performance degradation to the access performance.
[0004]
In recent years, a CD-R / RW drive has attracted a great deal of attention as a storage device because of its high compatibility with a CD-ROM drive that is standardly installed in a personal computer (PC).
As a result of fierce development competition, CD-ROM drives have become very fast in playback speed, and CAV playback has become commonplace.
[0005]
On the other hand, CD-R / RW drives are still in the process of development, and although the recording speed is gradually increased, there is a gap with the reproduction speed, and above all, CAV recording has not been put into practical use.
That is, in the CD-R / RW drive, if the current recording / reproducing speed is made the same, the reproducing speed must be lowered to the recording speed.
[0006]
However, considering only reproduction, the higher the speed, the better the performance, and the current CD-R / RW drive inevitably has a specification that the reproduction speed is faster than the recording speed.
[0007]
CD-R is a medium that can be recorded only once, and information is recorded by additional recording. Therefore, it is less necessary to reproduce information recorded in the past, and the reproduction operation is less likely to occur during a series of recording operations.
[0008]
However, the CD-RW can be overwritten, and the R / RW drive performs random recording and reproduction on blocks called packets on the CD-RW. That is, the CD-R / RW drive can be used as a random block access device capable of recording / reproducing, similar to the MO, if the CD-RW is used.
[0009]
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 a reproducing operation during a certain recording operation cannot be avoided.
[0010]
In the CD-R / RW drive, if the recording speed and the reproduction speed are the same, an access time required to move the head is sufficient. However, if the recording speed and the reproduction speed are different, a spindle motor needs to be changed. For this reason, the time required for moving the head many times is required, and the access time is greatly increased.
[0011]
That is, the recording / reproducing performance is significantly reduced.
This decrease in recording / reproducing performance becomes more significant as the difference between the recording speed and the reproducing speed increases.
In general, in order to minimize the deterioration of the recording / reproducing performance, it is preferable to set the recording speed and the reproducing speed to be the same.
[0012]
Conventionally, many CD-R / RW drives have a setting that enables playback at the same speed as recording, and the recording speed and playback speed can be made the same by setting from the host computer.
[0013]
[Problems to be solved by the invention]
However, with conventional CD-R / RW drives, the current mainstream CD-RW driver software is not designed to dynamically change the regeneration speed, so CD-ROM playback can be performed at the maximum speed. However, there is a problem that even if it is desirable to reproduce the CD-RW at the maximum speed unless recording is performed.
[0014]
The present invention has been made in order to solve the above-described problem, and even if the playback speed is not set from the host computer, the recording / playback performance can be maximized by appropriately controlling the playback speed at the time of recording and playback. The purpose is to do so.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a data recording / reproducing apparatus for recording or reproducing data in a spiral or concentric manner by controlling a recording medium so that the linear velocity is constant and rotationally driving the recording medium. when receiving, the means for determining whether or not a read command number of consecutively received is less than the prescribed value set in advance, less than a specified value read command number preset received continuously by the means When it is determined that the read speed is set to the same as the previous write speed, the read process is executed. When it is determined that the number of read commands continuously received is equal to or greater than a preset value, the host computer specifies it is provided with a means for performing the read process by setting the read speed.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a block diagram showing the configuration of an optical disk drive according to an embodiment of the present invention.
[0020]
This optical disk drive includes 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-ROM decoder 7, a memory manager 8, a memory 9, and a host interface (I / F). 10, a CD encoder 11, a CD-ROM encoder 12, an ATIP decoder 13, an LD driver 14, and a system controller 15.
[0021]
The system controller 15 is a microcomputer composed of a CPU or the like. The system controller 15 is connected to the other main parts via control signal lines and data signal lines (not shown), and controls each part to control the entire optical disk drive. Control.
[0022]
The optical disk 20 is rotationally driven by the spindle motor 1, and the motor driver 2 and the servo processing unit 3 control the spindle motor 1 so that the linear velocity is constant. This linear velocity can be changed in stages.
[0023]
In addition, the motor driver 2 and the servo processing unit 3 control the focus actuator, the track actuator, and the seek motor based on the signals obtained from the light receiving element and the position sensor, and the laser beam spot is placed at the target location on the optical disk 20. Control to position.
[0024]
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, which are not shown, and is attached to an optical disc 20 such as a CD-ROM, CD-R, and CD-RW. Irradiate with laser light.
[0025]
When reading data on the optical disc 20, the reproduction signal obtained by the optical pickup 4 is amplified and binarized by the read amplifier 5, and then input to the CD decoder 6 to undergo deinterleaving and error correction processing. .
The data is input to the CD-ROM decoder 7 and subjected to error correction processing in order to further improve the reliability of the data.
[0026]
After that, the data is temporarily stored in the memory (buffer RAM) 9 by the memory manager (buffer manager) 8, and when it is prepared as sector data, it is sent to the host computer via the host interface (I / F) 10 such as ATAPI or SCSI. Sent.
[0027]
On the other hand, when data is written on the optical disc 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.
[0028]
Writing is started when a certain amount of data is stored in the memory 9, but before that, the laser beam spot must be positioned at the writing start point on the optical disk 20.
[0029]
The write start point is obtained from a wobble signal based on a wobble that has been carved in advance on the optical disc 20 by meandering tracks.
The wobble signal includes absolute time information called ATIP, and the absolute time information can be extracted by the ATIP decoder 13.
The synchronization signal generated by the ATIP decoder 13 is input to the CD encoder 11 so that data can be written at an accurate position.
[0030]
Data in the memory 9 is subjected to error correction code addition and interleaving by the CD-ROM encoder 12 and the CD encoder 11, and is recorded on the optical disk 20 via the LD driver (laser control circuit) 14 and the optical pickup 4.
[0031]
The read speed and write speed are set in several steps, and the maximum read speed can be set to be sufficiently faster than the maximum rat speed. The speed can be individually specified from the host computer.
[0032]
FIG. 2 is a table showing an example of the time required for the write process when the recording speed and the reproduction speed are the same and different.
In this list, it is easy to see that there is a big difference in execution time during write processing such as when copying files depending on whether the write speed (recording speed) and read speed (playback speed) are the same or different. Show.
[0033]
FIG. 3 is a graph based on the numerical values shown in FIG. 2. The vertical axis represents the accumulation of data read / written, the horizontal axis represents the elapsed time, and the straight line L1 indicated by the broken line in the figure represents the change in the speed 1. A broken line L2 indicated by a solid line indicates a change in speed 2.
[0034]
Normally, when the OS writes a file, it does not simply write, but reads the management information of the file, and alternately repeats writing and reading although the write ratio is high.
[0035]
Therefore, the list in FIG. 2 shows that the time when writing, writing, reading, writing, reading, and writing data of 1800 KB for one write and 600 KB for read is the same quadruple speed for write and read. In the case of 1, the value is obtained when the write is 4 × speed but the read is the speed 2 of 8 × speed.
[0036]
If the command overhead is omitted and the calculation is performed only with the data transfer rate, the 4 × speed is 600 KB / S, the 8 × speed is 1200 KB / S, the speed 1 is 11 seconds, and the 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 1 second.
[0037]
It is clear that when the amount of read data between writes is small, the benefits of high-speed reading cannot be obtained, and the effect of time loss due to shifting is very large.
[0038]
Therefore, the branch point of whether the speed 1 is good or the speed 2 is good is 2400 KB in terms of the read data amount, but there is almost no case of reading such a large amount of data by a normal read between writes, and the current OS and Large shifts in the driver will lead to performance degradation.
[0039]
Next, functions and processes involved in the description of 請 Motomeko of the invention in the optical disc drive of this embodiment, the function and processing of the reference example of the present invention will be described.
[0040]
(1) Functions and Processing of Reference Example of the Present Invention Here, the system controller 15 of the optical disk drive controls the recording medium so that the linear velocity is constant and drives the recording medium to rotate in a spiral or concentric form. Control means for recording or reproducing data, means for determining whether or not a read command precedes the read command when a read command is received, and the write speed immediately before when the write command is determined by the means The read process is executed with the same read speed set, and when it is determined that the command is not a write command, the read speed specified by the host computer is set and the read process is executed.
[0041]
FIG. 4 is a flowchart showing the processing contents of the reference example of the present invention in the optical disk drive shown in FIG.
In this process, it is determined in step 1 (indicated by “S” in the figure) whether or not a command is received. If no command is received, the process in step 1 is repeated. If it is a write command, the process proceeds to step 3. If it is not a write command, the process proceeds to step 6.
[0042]
In step 3, the write speed designated by the host computer is set, the process proceeds to step 4 to execute the write process, the process proceeds to step 5 and the write flag is set to “1”, and the process returns to the first process.
[0043]
In step 6, it is determined whether or not it is a read command. If it is a read command, the process proceeds to step 7 to determine whether or not the write flag is "1". If the write flag is "1", the process proceeds to step 8 and the previous write speed and The same read speed is set, the process proceeds to step 9, the write flag is set to "0", the process proceeds to step 10, the read process is executed, and the process returns to the first process.
[0044]
If it is determined in step 7 that the write flag is not "1", the process proceeds to step 11 to set the read speed designated by the host computer, the process proceeds to step 10 to execute the read process, and the process returns to the first process.
If it is determined in step 6 that the command is not a read command, the process proceeds to step 12 to execute processing of other relevant commands, and returns to the first process.
[0045]
Further, this process will be described.
When receiving the write command, the system controller 15 sets the write speed designated by the host computer, performs the write process, and sets the write flag to “1” after the write process.
[0046]
The write flag is a value used for determining whether or not the read command precedes the write command. When the write flag is “1”, the read speed is set to the same write speed as the immediately preceding write speed and the read process is performed. . Then, the write flag is set to “0” after the read process.
[0047]
When the read command is received, if the write flag is not “1”, the read speed designated by the host computer is set and the read process is performed.
By performing such an operation process, high read / write performance can be obtained.
[0048]
In this way, even when the write speed and read speed specified by the host computer are greatly different, the performance is not significantly reduced when the write and read are repeated.
[0049]
(2) Function and processing of another reference example of the present invention Next, in the above optical disk drive, when the writing speed is slow such as 1 × speed or 2 × speed and the spindle motor 1 has sufficient torque, In some cases, it is better to perform reading at a fixed speed that is slightly higher than reading at the writing speed.
[0050]
Therefore, like the system controller 15 of the optical disk drive, and that control means to record or reproduce data in a spiral or concentric recording medium controlled by driven rotation so that the linear velocity is constant, the read command Means for determining whether or not the preceding read command is a write command, and when it is determined that the command is a write command, the fixed read speed is set and the read process is executed. If it is determined, the function of means for executing a read process by setting a read speed designated by the host computer may be performed.
[0051]
FIG. 5 is a flowchart showing the processing contents of another reference example of the present invention in the optical disk drive shown in FIG.
The operation process shown in FIG. 5 is changed from the process for setting the same read speed as the previous write speed shown in FIG. 4 to the process for setting a fixed read speed.
[0052]
In this process, it is determined whether or not a command is received at step 21 (indicated by “S” in the figure). If no command is received, the process of step 21 is repeated. If a command is received, the process proceeds to step 22 to determine whether or not the command is a write command. If it is a write command, the process proceeds to step 23, and if it is not a write command, the process proceeds to step 26.
[0053]
In step 23, the write speed designated by the host computer is set, the process proceeds to step 24, the write process is executed, the process proceeds to step 25, the write flag is set to "1", and the process returns to the first process.
[0054]
In step 26, it is determined whether or not it is a read command. If it 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 and a fixed read speed is set. Then, the process proceeds to step 29, the write flag is set to "0", the process proceeds to step 30, the read process is executed, and the process returns to the first process.
[0055]
If it is determined in step 27 that the write flag is not "1", the process proceeds to step 31 to set the read speed designated by the host computer, and the process proceeds to step 30 to execute the read process and return to the first process.
On the other hand, if it is determined in step 26 that the command is not a read command, the process proceeds to step 32 to execute processing of other relevant commands, and returns to the first process.
[0056]
In this way, the performance improvement effect is enhanced when the write process is slow and the amount of read data is large.
[0057]
(3) Functions and processing of still another reference example of the present invention In the above operation processing, the read command between writes is assumed to be one time. However, in actual operation processing such as file copy, a plurality of small block read commands are used. Issued once. Therefore, in the operation processing as described above, there is a possibility that the speed is shifted to the read speed designated by the host computer and the effect is almost lost.
[0058]
Therefore, it is preferable that the system controller 15 of the optical disc drive or the like keeps the reproduction speed immediately after data recording for a predetermined time and then performs the function of means for reproducing at a reproduction speed designated by the host computer.
[0059]
FIG. 6 is a flowchart showing the processing contents of still another reference example of the present invention in the optical disk drive shown in FIG.
[0060]
In this process, a read command between writes is performed at the same read speed as the previous write speed for a certain time (for example, 10 seconds), and when it is exceeded, the read speed specified by the host computer is set. It may be determined based on the result of comprehensively judging the operation of the OS, the performance of the optical disk drive, the operational feeling, and the performance.
[0061]
In this process, it is determined whether or not 1 second has elapsed in step 41 (indicated by “S” in the figure). If 1 second has elapsed, the process proceeds to step 47, and if the write timer is not “0”, the write timer is subtracted. 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 is received.
[0062]
If the command is not received in step 42, the process returns to step 41. If the command is received, the process proceeds to step 43 to determine whether it is a write command. If it is a write command, the process proceeds to step 44. move on.
[0063]
In step 44, the write speed designated by the host computer is set, and the process proceeds to step 45 to execute the write process, and the process proceeds to step 46 to set the write timer to "10" and returns to the first process.
[0064]
In step 48, it is determined whether or not it is a read command. If it 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 and the previous write is performed. The same read speed as the speed is set, the process proceeds to step 51 to execute the read process, and the process returns to the first process.
[0065]
If it is determined in step 49 that the write timer is "0", the process proceeds to step 52, the read speed designated by the host computer is set, the process proceeds to step 51, the read process is executed, and the process returns to the first process.
On the other hand, if it is determined in step 48 that the command is not a read command, the process proceeds to step 53 to execute processing of other relevant commands, and returns to the first process.
[0066]
In this way, when the write speed designated by the host computer and the read speed are greatly different, the performance is not significantly reduced even if the file is copied using the OS.
Further, since it is not necessary for the user to change the read speed each time the optical disk drive is used for the purpose of reading or the purpose of writing, the operability can be improved.
[0067]
(4) Functions and processes related to claim 1 of the present invention It is quite effective means to determine the speed change point in a certain time as in the above-mentioned operation process, but the time counting function is provided in the program. Incorporation increases the complexity of the program and the code size of the program.
[0068]
Therefore, the system controller 15 or the like of the optical disk drive receives a read command and control means for recording or reproducing data in a spiral shape or a concentric shape by controlling the recording medium to rotate at a constant linear velocity. when, means for determining whether or not a read command number of consecutively received is less than the prescribed value set in advance, when less than the specified value read command number preset received continuously by the means When it is judged, the same read speed as the previous write speed is set and the read process is executed. When it is judged that the number of continuously received read commands is equal to or more than a preset specified value, the read designated by the host computer is performed. It is preferable to perform the function of means for executing the read processing by setting the speed.
[0069]
Figure 7 is a flow chart illustrating processes relating to claim 1, wherein the present invention in the optical disk drive shown in FIG.
In this process, the number of read commands is counted as a method of determining the speed change point more simply than the above-described process.
[0070]
The number of commands is cleared to “0” after the write process, and is incremented when the read process is performed. If the number of commands is less than the specified value, the read speed is the same as the previous write speed, and when the command speed is exceeded, the read speed specified by the host is set.
[0071]
In this process, it is determined in step 61 (indicated by “S” in the figure) whether or not a command is received. If no command is received, the process in step 61 is repeated. If YES in step 63, the flow advances to step 63; otherwise, the flow advances to step 66.
[0072]
In step 63, the write speed designated by the host computer is set, the process proceeds to step 64, the write process is executed, the process proceeds to step 65, the command count is set to "0", and the process returns to the first process.
[0073]
In step 66, it is determined whether or not it is a read command. If it is a read command, the process proceeds to step 67 and it is determined whether or not the number of commands is less than a predetermined value set in advance. The same read 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.
[0074]
If it is determined in step 67 that the command count is equal to or greater than the specified value, the process proceeds to step 71 to set the read speed designated by the host computer, proceeds to step 69 to execute the read process, and proceeds to step 70 to determine the command count. Add 1 ″ to return to the first process.
On the other hand, if it is determined in step 66 that the command is not a read command, the process proceeds to step 72 to execute processing of other relevant commands, and returns to the first process.
[0075]
In this way, even if the write speed and read speed specified by the host computer differ greatly, the performance will not be significantly reduced when the write and read are repeated, and the program can be easily changed. A great effect can be obtained, and the code size of the program can be reduced.
[0076]
【The invention's effect】
As described above, according to the data recording / reproducing apparatus of the present invention, the performance at the time of recording and reproduction can be automatically maximized even if the reproduction speed is not set from the host computer.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an optical disc drive according to an embodiment of the present invention.
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.
3 is a graph based on the numerical values shown in FIG.
4 is a flowchart showing processing contents of a reference example of the present invention in the optical disc drive shown in FIG. 1; FIG.
FIG. 5 is a flowchart showing the processing contents of another reference example of the present invention in the optical disc drive shown in FIG. 1;
6 is a flowchart showing the processing contents of still another reference example of the present invention in the optical disc drive shown in FIG. 1; FIG.
7 is a flow chart illustrating processes relating to claim 1, wherein the present invention in the optical disk drive shown in FIG.
[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 disc

Claims (1)

In a data recording / reproducing apparatus that records or reproduces data in a spiral or concentric manner by controlling and rotating the recording medium so that the linear velocity is constant,
Means for determining whether or not the number of read commands received continuously is less than a preset value when a read command is received, and a preset value for which the number of read commands continuously received by the means is preset If it is determined that the number of read commands is less than that, the read speed is set to be the same as the previous write speed, and the read process is executed. A data recording / reproducing apparatus comprising a means for executing a read process by setting a designated read speed.

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