KR100524932B1 - Speed control method of disc drive and apparatus therefor, and recording media which a program therefor is recorded - Google Patents

Abstract

The present invention relates to a method of controlling a speed of a disk drive, and more particularly, to a method of measuring a time interval of a command from a host, controlling a speed according to the measured time interval, an apparatus suitable for the same, and a recording medium including the method.

According to an aspect of the present invention, there is provided a method of controlling a speed of a disk drive, the method comprising: setting reference time intervals according to a speed of a disk drive; Performing a command applied from a host according to a set speed; Measuring a time interval between commands applied from a host; And comparing the measured time interval with a reference time interval corresponding to a currently set double speed; and resetting a double speed of the disk drive according to a result of the comparing process.

In the method of controlling the speed of a disk drive according to the present invention, the time interval of a command applied from the host is measured, and the measured time interval is compared with a time value set according to the speed, thereby resetting the speed of the disk drive according to the result. According to the data processing speed of the host, the disk drive speed can be set adaptively.

Description

Speed control method of disc drive and apparatus therefor, and recording media which a program therefor is recorded}

The present invention relates to a method of controlling a speed of a disk drive, and more particularly, to a method of controlling a speed of a disk drive and a device suitable for the same, and a program suitable for measuring a time interval of a command from a host and controlling the speed according to the measured time interval. A recording medium containing the

Disk drives function as peripherals in computer systems and are becoming an essential peripheral today. Disc drives include CD-ROM drives, hard disc drives (HDDs), magneto-optical drives, and digital video disc (DVD) drives.

In particular, optical disc devices, for example, optical disc devices that record and read signals recorded on optical discs such as CD-ROMs (Compact Disc ROMs) or DVDs, are rapidly increasing in speed for faster data recording and reading. to be.

The higher the speed of the disc, the faster the data can be processed. However, the higher the speed, the higher the read error, recording error, vibration, and noise. Therefore, it is necessary to properly control the speed of the disc. In particular, when the disk has an eccentric or surface vibration component, excessive vibration and noise are generated due to the high speed, and the higher the speed, the greater the centrifugal force on the disk, so that the disk is weak, scratch, or crack. If the disc is damaged by a) or the like, it may be broken.

The conventional disk speed control method controls the speed in consideration of the type of data recorded on the disk, the error occurrence rate when reading out, the jitter rate when recording, the eccentricity of the disk or the surface vibration component, and the like.

For example, if the data recorded on the disc is audio data, it is not necessary to operate the disc drive at high speed because the playback speed is the actual playing time even if it is read out quickly. On the other hand, when the data recorded on the disk is program or document data, it is necessary to operate the disk drive at high speed because the faster the data is unfolded. Therefore, the reproduction speed can be controlled according to the type of data to be accessed.

On the other hand, Patent Application No. 96-60512 (Applicable to Nov. 28, 1996, Applicant; Samsung Electronics) discloses a speed control method for converting to a lower speed when an error occurs when reading from the CD-ROM drive.

In addition, Patent Application No. 96-69314 (filed on Nov. 28, 1996, Applicant: Samsung Electronics) discloses a speed control method for measuring an eccentricity of a mounted disk and determining the speed to correspond to the measured eccentricity.

In addition, Patent Application No. 97-30655 (filed June 18, 1997, Applicant: Samsung Electronics) discloses a method of measuring data transmission rate, access time, and the like and controlling a double speed with reference to the measured result.

However, the above conventional speed control method does not consider the data processing speed at the host. For example, in the speed control method according to the data type, there are two reproduction methods for reading audio data from the host. One is a direct playback method, in which audio signals are played directly while audio data is read from an audio disk, and the other is an indirect playback method, in which audio data is read from an audio disk and stored in a storage medium such as a hard disk drive for later playback. That's how. The latter method is collectively called CD-EXTRACTION.

In the case of the direct playback method, the audio data read from the audio disc is stored in the buffer, the audio data stored in the buffer is sequentially converted to digital / analog, and the audio data stored in the buffer is exhausted. It reads and fills the buffer, eliminating the need to run a disk drive at high speed.

In the case of CD-EXTRACTION, the audio data file read from the audio disk is copied to a storage medium such as a hard disk drive, so the host reads data as quickly as possible. Therefore, in the case of CD-EXTRACTION, it is necessary to operate the disk drive at high speed.

On the other hand, even in the case of the direct playback method, it is necessary to operate the disk drive at a relatively high speed when filling the audio data into the buffer, but the disk drive can be operated at high speed while digitally / analog converting and outputting the audio data stored in the buffer. no need.

Thus, it is necessary to set the disk drive double speed according to the data processing speed at the host.

It is an object of the present invention to provide an improved double speed control method for adaptively controlling the speed of a disk drive in accordance with the data processing speed in a host.

Another object of the present invention is to provide a disk drive suitable for the above double speed control method.

Another object of the present invention is to provide a recording medium on which a program suitable for the above double speed control method is recorded.

The speed control method of the disk drive according to the present invention to achieve the above object is

In the speed control method of the disk drive that is operatively connected to the host,

Setting respective reference time intervals according to the speed of the disk drive;

Performing a command applied from a host according to a set speed;

Measuring a time interval between commands applied from a host;

Comparing the measured time interval with a reference time interval corresponding to a currently set double speed;

And resetting the speed of the disk drive according to the result of the comparison process.

Here, the command applied from the host is preferably a read command or a write command.

Disc drive according to the present invention to achieve the above other object

A memory for storing a table containing respective reference time intervals according to double speed;

A timer that counts the time interval between instructions provided by the host;

It controls the operation of the disk drive according to the command provided by the host, compares the time interval counted by the timer with the reference period interval at the corresponding speed in the table, and sets the speed of the disk drive according to the comparison result. It characterized in that it comprises a control unit.

A recording medium according to the present invention for achieving the above another object is

Performing a command applied from a host according to a set speed;

Measuring a time interval between commands applied from a host;

Comparing the measured time interval with a reference time interval corresponding to a currently set double speed;

According to the result of the comparison process, a program including a process of resetting the speed of the disk drive is recorded and can be read by a computer.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

The method of controlling a speed of a disk drive according to the present invention is characterized by measuring a time interval of commands generated from a host and controlling a speed of a disk drive according to the measured time interval. Specifically, in the case of CD-EXTRACTION, the host only stores data read from the disk drive in a hard disk drive or the like, and thus generates a read command relatively frequently. On the other hand, in the direct playback method, the host generates a read command relatively slowly because the host reads the audio data while playing the audio data stored in the buffer from the disk drive.

The present invention measures the time interval between commands based on the host generating a command (lead command or write command) according to its data processing operation, and adaptively sets the speed of the disk drive according to the measured time interval. .

1 is a flowchart illustrating an embodiment of a method of controlling a speed of a disk drive according to the present invention. The example shown in FIG. 1 shows a read operation to measure the time interval of the read command and to set the reproduction speed according to the measured time interval.

First, it is determined whether it is a read command (s102). If it is not a read command, another command corresponding to the read command is performed (s104).

It is checked whether the value of the timer is smaller than the reference time interval Th (s106). Here, the value of the reference time interval Th varies depending on the currently set double speed. The timer is for measuring the time interval from the previous read command to the current lead command.

If the value of the timer is not smaller than the reference time interval Th, it is set to a low speed (s108), otherwise it is set to a high speed. (s110)

Here, the setting of the low speed and the high speed may be performed linearly or nonlinearly. If it is nonlinear, it is set to one of several discrete speeds. For example, if the double speed is set nonlinearly in the form of power of 2, such as 1, 2, 4, 8 ,,,, and if the currently set double speed is 8 times, and the value of the Tyver is not smaller than the reference time interval Th, then 4 It is set at double speed.

If the data processing speed on the host is faster than the speed of data transfer from the disk drive, the host will issue a read command quickly and vice versa. The speed of data transfer in the disk drive is determined by the speed, and if the data processing speed in the host is faster than the speed of data transfer in the disk drive, the disk drive sets the high speed to transfer data faster. Conversely, if the data throughput on the host is slower than the disk drive's data transfer rate, the disk drive will set a slower speed to transfer the data more slowly.

By this operation, the disk drive can be set adaptively to match the data processing speed at the host.

2 is a table showing exemplary values of the reference time interval Th at double speed. These values are set experimentally for the application program repeatedly applying the read command for the CD-ROM drive's double speed test. In practice, these values may vary depending on the model of the disc drive, the type of media, and the recording / playback mode. . Importantly, the value of the reference time interval Th varies depending on the speed.

The value shown in FIG. 2 is a value obtained when the transmission speed at 8x speed is set to 8ms. For 32x speed, this represents the maximum speed, and the speed at the outer periphery of the disc. Therefore, in the case of 32 times speed, the actual speed is equivalent to 25 times speed. Applying this proportionally for all double speeds, the transmission speeds at 48, 32, 16, 8, 4, 2, and 1x are 1.22, 2, 4, 8, 16, 32, and 64, respectively.

The read command is executed (s112). The disk drive reads data written to the disk in units of sectors or clusters and transmits the data to the host (s114).

It is determined whether the data transmission is completed (s116).

If the data transfer is completed, the timer is reset (s118).

The timer counts the elapsed time until the next read command is issued, and the counted gal is compared with a reference time interval Th corresponding to the currently set speed, and the speed is reset according to the comparison result.

3 is a flowchart illustrating another embodiment of a method of controlling a speed of a disk drive according to the present invention. The example shown in Fig. 3 shows the recording operation, which measures the time interval of the recording command and sets the recording double speed according to the measured time interval.

First, it is determined whether it is a recording command (s302). If it is not a recording command, another command corresponding to the recording command is performed (s304).

It is checked whether the value of the timer is smaller than the reference time interval Th (s306). Here, the value of the reference time interval Th varies depending on the currently set double speed. The timer is for measuring the time interval from the previous write command to the current write command.

If the value of the timer is not smaller than the reference time interval Th, it is set to a low speed (s208), otherwise it is set to a high speed. (s310)

The data processing speed in the disk drive causes the host to transfer data from the host to generate a write command faster and vice versa to a slower write command.

The data writing speed on the disk drive is determined by the double speed, and the data writing speed of the disk drive sets a faster speed so that the disk drive writes data faster than the data processing speed on the host. Conversely, if the data write speed of the disk drive is slower than the data transfer rate from the host, the disk drive will set a slow speed to write data more slowly.

By this operation, the disk drive can set the recording double speed adaptively in accordance with its data writing speed.

4 is a table showing exemplary values of the reference time interval Th according to the recording double speed. As shown in Fig. 4, enable is provided to limit the recording speed. In the reading operation, except for a special case, it is almost unnecessary to limit the reproduction speed, but in the recording operation, the jitter amount increases as the recording speed increases, so it is necessary to limit the upper limit of the recording speed. On the other hand, it may be necessary to limit the recording speed depending on the type of media.

Enabling or disabling detects the jitter amount of the recording signal, and disables the recording at the corresponding recording speed when the value exceeds the predetermined limit value.

When setting the speed, set the speed only when it is enabled by referring to the enable / disable status. In the example of FIG. 4, since it is disabled at 16x speed or more, it is possible to increase the speed only up to 8x speed.

The write command is executed (s312). The disk drive writes data to the disk in sectors or clusters (s314).

It is determined whether data recording has been completed (s316).

If the data recording is completed, report the result to the host and reset the timer (s318).

The timer counts the elapsed time until the next write command is issued, the counted gal is compared with the reference time interval Th corresponding to the currently set speed, and the speed is reset according to the comparison result.

The host receives a report from the disk drive that data recording has been completed and issues a write command for recording the next data. At this time, if the data write speed on the disk drive is slower than the data processing speed at the host, the write command will be applied faster and the write command will be applied slower.

The time interval between the write commands is counted by a timer, the counted time interval is compared with the reference time interval Th according to the recording speed, and the recording speed is reset according to the comparison result.

5 is a block diagram showing the configuration of a disk drive according to the present invention, showing an example applied to the optical disk drive.

The optical disc drive shown in FIG. 5 includes a disc 502, a pickup unit 504, an RF amplifier 506, a digital signal processor 508 (Digital Signal Processor, hereinafter referred to as a DSP), an interface unit 510, and a controller ( 512, a servo controller 514, and a driver 516.

The disk 502 may be a CD, CD-ROM, DVD, or the like as an optical recording / reproducing medium.

In the reading operation, the pickup unit 504 irradiates the rotating disk 502 with laser light, receives the laser light reflected from the disk 502, and receives an RF signal in an analog form corresponding to the amount of the received laser light. Output On the other hand, in the recording operation, the pickup section 504 is configured to generate laser light corresponding to the recording pulses provided by the recording modulation section 518 to irradiate the disk 502.

The RF amplifier 506 amplifies and outputs an RF signal provided from the pickup unit 504 with a predetermined amplification degree. The RF signal amplified by the RF amplifier 506 is provided to the DSP 508. On the other hand, the RF amplifier 506 generates a focus servo error signal and tracking servo error signals necessary for servo control from the RF signal to provide to the servo controller 514.

In the reproducing operation, the DSP 508 demodulates and outputs a digital signal from the RF signal. On the other hand, in the write operation, the DSP 508 modulates the data provided from the interface unit 510 and provides it to the write modulator 518. The write modulator 518 generates a write pulse corresponding to the modulated data provided by the DSP 508 and provides it to the pickup unit 504.

The interface unit 510 interfaces to allow data transmission and reception between the host, the controller 512, and the DSP 508. An example of such an interface unit 510 is an IDE controller.

The controller 512 is responsible for the control of the components shown in FIG. 5, in particular, performs a speed control operation according to the present invention. The controller 512 is implemented as a microprocessor and performs a control operation by a software routine stored in the ROM 520.

Software routines that perform double speed control operations in accordance with the present invention are stored in ROM 520 like other software routines.

The software routine for performing the double speed control operation according to the present invention is programmed to perform the following process, and controls the control unit 512 according to the programmed processes to set the speed of the disk drive.

1) performing a command applied from the host according to the set speed;

2) measuring a time interval between commands applied from the host;

3) comparing the measured time interval with a reference time interval corresponding to the currently set double speed;

4) The process of resetting the speed of the disk drive according to the result of the comparison process

The RAM 522 stores temporary data generated during the operation of the controller 512 and stores the double speed setting table 522a in the present invention.

6 shows the contents of the double speed setting table 522a. The speed setting table 522a has a mode, a reference time interval Th, and enable / disable items. The mode item is for discriminating the recording / reproducing mode, and the enable / disable item is referred to in the recording mode. The reference time interval Th item is for setting a time value compared with the count value of the timer 522. The enable / disable item is to enable / disable the corresponding speed in the recording mode.

The mode item is set according to the command received from the host. For example, if the command received from the host is a read command, the mode item is set to indicate the playback mode. The reference time interval Th item is a preset value and in some cases is programmed to be changed according to the type of media. The enable / disable item is set according to the amount of jitter measured in the recording mode. If it is set to disable, setting of the corresponding speed is prohibited.

The servo controller 514 controls the focusing operation and the tracking operation of the pickup unit 502 with reference to the focus error signal and the tracking error signal provided from the RF amplifier 506. The driver 516 controls the rotation of the spindle motor (not shown) and the servo operation of the pickup unit 502 to rotate the disk 502 under the control of the servo controller 514.

In the apparatus shown in FIG. 5, the speed control method will be described in detail.

The command from the host is received through the interface unit 510 and transmitted to the controller 512. The controller 512 controls the components shown in FIG. 5 to interpret a command from the host to perform a designated operation.

If the command from the host is a read command, the controller 512 controls the driver 516 to rotate the disk 502 at a predetermined speed and reset the timer 522. On the other hand, the control unit 512 sets the mode item to reproduction in the double speed setting table 522a.

Data read from the disk 502 is provided to the host through the DSP 508 and the interface unit 510.

When the next read command is applied from the host, the controller 512 compares the value counted by the timer 522 with the reference time interval Th set in the double speed setting table 522a. If the value counted by the timer 522 is smaller than the reference time interval Th corresponding to the currently set double speed, the controller 512 controls the drive unit 516 to rotate the disk 502 at a faster double speed than the currently set double speed. The timer 522 is reset.

On the contrary, if the value counted by the timer 522 is greater than the reference time interval Th corresponding to the currently set double speed, the controller 512 controls the drive unit 516 to rotate the disk 502 at a slower speed than the currently set double speed. The timer 522 is reset.

The speed control operation of the controller 512 adaptively controls the playback speed of the disk drive in accordance with the data processing speed of the host.

If the command from the host is a write command, the controller 512 first controls the drive unit 516 to rotate the disk 502 at a predetermined double speed, and resets the timer 522. On the other hand, the control unit 512 sets the mode item to recording in the double speed setting table 522a.

Data provided from the host is provided to the write modulator 518 via the DSP 508 and the interface unit 510 and is recorded on the disc 502 by the action of the pickup unit 504.

The controller 512 reports the data provided from the host to the disk 502. The host applies a recording command for recording the next data with reference to the recording completion report from the control unit 512.

When the next write command is applied from the host, the controller 512 compares the value counted by the timer 522 with the reference time interval Th set in the double speed setting table 522a. If the value counted by the timer 522 is smaller than the reference time interval Th corresponding to the currently set recording speed, the controller 512 controls the drive unit 516 to write data to the disk 502 at a faster speed than the currently set speed. Control to write and reset timer 522. Whether recording / reproducing is found can be known by referring to the mode item of the double speed setting table 522a.

On the contrary, when the value counted by the timer 522 is larger than the reference time interval Th corresponding to the currently set double speed, the controller 512 controls the driver 516 to record data on the disc 502 at a slower speed than the currently set double speed. Control, and the timer 522 is reset.

By the speed control operation of the control unit 512, the recording speed of the disk drive is adaptively controlled in accordance with the recording speed of the disk drive.

On the other hand, the controller 512 records the data on the disk 502, reads the recorded data, detects the jitter amount, and sets the enable / disable item of the double speed setting table 522a according to the detected jitter amount.

For example, if the detected jitter amount exceeds a predetermined threshold, the enable / disable item is set to disable so that recording is not performed at the currently set speed or higher speed.

Although an example of an optical disc drive has been described in describing an embodiment of the present invention, it should be noted that the recording control method according to the present invention can be equally applied to a hard disc drive.

As described above, the method for controlling the speed of a disk drive according to the present invention measures a time interval of a command applied from a host, compares the measured time interval with a time value set according to the speed, and accordingly the speed of the disk drive according to the result. By reconfiguring the disk drive, the speed of the disk drive can be set adaptively according to the data processing speed of the host.

1 is a flowchart illustrating an embodiment of a method of controlling a speed of a disk drive according to the present invention.

2 is a table showing exemplary values of the reference time interval Th at double speed.

3 is a flowchart illustrating another embodiment of a method of controlling a speed of a disk drive according to the present invention.

4 is a table showing exemplary values of the reference time interval Th according to the recording double speed.

5 is a block diagram showing the configuration of a disk drive according to the present invention, showing an example applied to the optical disk drive.

Fig. 6 shows the contents of the double speed setting table.

Claims (7)

In the speed control method of the disk drive that is operatively connected to the host, Setting respective reference time intervals according to the speed of the disk drive; Performing a command applied from a host according to a set speed; Measuring a time interval between commands applied from a host; Comparing the measured time interval with a reference time interval corresponding to a currently set double speed; And resetting the speed of the disk drive according to a result of the comparing process. The method of claim 1, wherein the command applied from the host is a read command or a write command. delete A memory for storing a table containing respective reference time intervals according to double speed; A timer that counts the time interval between instructions provided by the host; It controls the operation of the disk drive according to the command provided by the host, compares the time interval counted by the timer with the reference period interval at the corresponding speed in the table, and sets the speed of the disk drive according to the comparison result. Disk drive including a control. The disk drive of claim 4, wherein the timer counts a time interval between read commands or a time interval between write commands. The method of claim 4, wherein The table includes an enable / disable item indicating that the setting of the corresponding speed is prohibited when the jitter amount of data recorded on the disk exceeds a threshold value. And the control unit prohibits the setting of the disabled double speed. Performing a command applied from a host according to a set speed; Measuring a time interval between commands applied from a host; Comparing the measured time interval with a reference time interval corresponding to a currently set double speed; A recording medium readable by a computer on which a program is recorded, the method including resetting a speed of a disk drive according to a result of the comparing process.