KR20090083578A - Method and apparatus for recording data on disc - Google Patents

Abstract

The present invention relates to a method and apparatus for recording data on a disc. In one embodiment of the present invention, the capacity of the data requested to be recorded is checked, and a recording start position is calculated from the predetermined position of the disc in reverse from the predetermined position, and the data requested to be recorded from the calculated position is When the recording is completed, management information on the recorded data is recorded in the navigation area. The predetermined position is the last position of the recordable space of the disc or the last position of the region located at the outermost periphery of one or more regions where the recordable space is continuous over the identified capacity. The calculating step is performed only when the recording mode is a mode in which the recording speed increases as the recording proceeds, and when the recording is requested in a constant recording speed, the requested data can be recorded from the first recordable position.

Description

Method and apparatus for recording data on disc

The present invention relates to a method and apparatus for recording data on a disc.

Recently, optical discs capable of recording high quality video data and high quality audio data, such as CDs (e.g. CD-R, CD-RW) or DVDs (e.g. DVD-R / RW or DVD + R / RW) ) And a disk device capable of recording / reproducing it are widely used.

A recordable optical disc device, for example, a DVD-Recorder, records data sequentially in the circumferential direction from the inner circumference of the disc when recording data in the data area of the optical disc. For example, a disk recording apparatus mounted on a PC records sequentially from the inner circumference to the outer circumferential direction even when recording large-capacity video data stored on a hard disk onto an optical disk.

Since the radius of the innermost and outermost circumference of the data area in the optical disk is about 2.4 times the difference, when the optical disk is rotated by the constant angular velocity (CAV) method, the linear velocity at the outermost circumference is doubled. It corresponds to about 2.4 times the linear velocity in the innermost circumference. The maximum recording speed of the optical disk device is determined by the rotational speed of the spindle motor, the transfer function of the actuator, the output power of the laser diode, and the like, and generally corresponds to the recording speed in the outermost circumference.

Therefore, the highest recording speed in the innermost circumference becomes about 1 / 2.4 times the highest recording speed in the optical disk device, that is, the highest recording speed in the outermost circumference. For example, if the maximum speed of the device is 16x, 16x speed is possible only in the outermost circumference of the disc, and only 16 / 2.4 = 6.7x speed is possible in the innermost circumference.

Therefore, when data is recorded from the inner circumference to the outer circumferential direction of the data area while the optical disk is rotated at a CAV method, i.e. at a constant angular speed, the data recording speed is 16 at a speed of about 6.7 (1 / 2.4 times 16x). It gradually increases at double speed.

In the case of an optical disc drive mounted on a PC, since the CAV mode with a constant rotation speed is mainly used as a data recording mode, the user wants to write data stored on the hard disk to the optical disc as fast as 16 times, for example, Since the optical disc drive writes from the inner circumference, that is, at 6.7 times, it does not provide the user's desired recording speed and slows down to 6.7 times at the inner circumference even when reading data.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method and apparatus for improving the data recording speed in an optical disk device.

The present invention has been created to achieve the above object, and a method for recording data on a disk according to an embodiment of the present invention includes the steps of: checking the capacity of the data requested for recording; Calculating a recording start position from the predetermined position of the disc in reverse from the determined capacity; And recording the recording requested data from the calculated position.

Disc recording apparatus according to another embodiment of the present invention, the recording / reproducing unit for recording data on the disc or read data from the disc to reproduce; A memory for storing management information read from the disk; And a control unit for controlling the recording / reproducing system, wherein the control unit checks the capacity of the data requested to be recorded, calculates a recording start position from the predetermined position of the disc and vice versa based on the confirmed capacity. And recording the requested data from the calculated position.

In the above embodiment, when the recording is completed, the control unit generates management information on the recorded data and records it in the navigation area.

In the above embodiment, the predetermined position may be the last position of the recordable space of the disc or the last position of the region located at the outermost periphery of one or more regions where the recordable space continues beyond the identified capacity.

In the above embodiment, the control unit may calculate the recording start position only when the requested recording mode is a mode in which the recording speed becomes faster as the recording proceeds, and when the recording is requested in the constant recording speed mode, recording is performed from the first recordable position. The requested data can be recorded.

In the above embodiment, the controller may reserve a space between the last position of the data already recorded on the disc and the recording start position as a title for data to be recorded later, the first of the reserved titles. The location and information indicating that the reserved title is not finished can be recorded in the navigation area, and data recorded from the calculated position can be managed as the next title of the reserved title.

Therefore, when recording data on the optical disc, the recording speed can be improved, and the reading speed can also be improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are diagrams for understanding the CLV (Constant Linear Velocity), CAV, ZCLV (Zone CLV), and PCAV (Partial CAV) modes, respectively, in which green is the data rate, and yellow is the speed of the spindle motor. Rotation speed. As shown in FIGS. 1 to 4, except for the CLV mode, all data rates are faster at the outer periphery than the inner periphery. The CLV mode is used to record data on a low speed disc, the PC drive is not currently used for high speed recording, and the CAV mode is currently used the most.

Fig. 1 illustrates the CLV mode, in which the transmission rate of the inner and outer circumferences is the same, and in the case of DVD, it is mainly used for low speed recording of 4 times or less.

FIG. 2 illustrates a CAV mode, which increases in data transmission rate as the outer periphery is used, and is used when recording at a high speed of 12 times or more in the case of a DVD drive. Recently, DVD drives are also available for recording at a speed of 18x or higher on the outside, and most CD-RW drives use CAV method. BD / HD-DVD has also been speeded up, and it has to follow the above method.

3 illustrates a ZCLV mode, in which the ZCLV mode has a low data rate up to a specific portion of the inner circle and a high data rate after the midline. DVD is mainly used at medium speeds such as 6x and 8x, and the address whose transmission rate is changed can be changed by the designer of the drive.

4 illustrates a PCAV mode, in which the transmission rate increases from the inner circumference to the mid-cycle, and the transmission rate is constant from the middle quartet. In case of DVD-RAM, it is widely used when writing 5x to 12x, and the address whose transmission rate is changed can be changed by the designer of the drive.

Most optical disc drives in PCs use the CAV, PCAV, and ZCLV modes, and the DVD recorders with hard disks use the above three recording modes. The CAV, PCAV, and ZCLV modes are characterized by faster data transfer speeds toward the outer periphery than the inner periphery. Therefore, even when the same amount of data is recorded or read out from the outer periphery, the time required for recording or reading out from the inner periphery is reduced. In other words, the data transfer speed is faster than outer to outer.

For example, when recording 160-second video data of XP quality from the inner circumference using the 16x DVD-R from the inner circumference, the transmission speed of the inner circumference is about 6.7 times, so it takes about 24 seconds. However, when recording from the outer periphery, the transfer speed is 16x, so the recording can be completed in about 10 seconds. In particular, if the user records a small amount of data will be greatly effective.

However, since it is not possible to record in the circumferential direction from the outer circumference of the disc in general, a position to start data recording must be determined. To do this, it is necessary to know in advance the capacity of data to be recorded and the last position of an area in which data can be recorded, and based on this, it is possible to calculate a position to start recording.

Therefore, in the present invention, as shown in Fig. 5, the position SP to start recording is calculated from the last position LP of the area where data can be recorded and the capacity of the data requested to be recorded, and thus calculated By recording the requested data from the location but increasing the recording speed while recording, the recording speed can be improved when recording the data on the disc.

The management information such as the last position of the area where data can be recorded, the position and size of the empty space where data can be recorded, and the like are the lead-in area and the recording management area which are located in the circumference of the data area or the head of the data area. It can be read from the navigation area and managed.

The present invention can be applied to various types of optical disc devices capable of recording such as DVD recorders. For example, a hard disc as an image recording device applied to an optical disc drive mounted on a PC or receiving and storing a broadcast program. The present invention can also be applied to a device in which an optical drive is combined with a storage medium such as a nonvolatile memory.

6 illustrates a configuration of a disk device to which the present invention is applied. The recordable disk device 200 includes an optical pickup 210 and an optical disk 100 that record or read data on the optical disk 100. Servo unit 220 for driving the optical pickup 210 to read data from or to record data on the optical disk 100, and to receive data from the optical pickup 210 to restore data. Or a signal processing unit 230 for converting data to be recorded or recorded into a signal for recording, a memory 240 for temporarily storing various information and data, and a controller 250 for controlling each component. Can be configured. The optical pickup 210, the servo unit 220, and the signal processor 230 may be integrated and managed as one recording / reproducing system.

The control unit 250 controls the data area of the optical disk 100 from the navigation area of the optical disk 100 inserted into the disk device 200, for example, the beginning of each title recorded in the data area. Information such as an end address, an address and a capacity of a recordable area is read and stored in the memory 240.

In addition, when the controller 250 receives a data recording request of a predetermined capacity from the user through a connected host (for example, a PC) (not shown) or through an input unit (not shown), the control unit 250 may enter the memory 240. Last position information capable of recording data is obtained from the managed area information, and a recording start position to start recording of the requested data is determined based on the last position information and the capacity of the requested data.

Thereafter, the controller 250 controls the servo unit 220 to move the optical pickup 210 to the recording start position, and transmits data transmitted from a storage medium (not shown) to the signal processor 230. And recording at the high speed on the optical disc 100 through the optical pickup 210, while recording in order to increase the recording speed of data, the maximum speed allowed by the apparatus 200 at each recording position. (In the CAV mode, the recording speed increases as the recording position advances to the outer periphery).

After the requested recording is completed, the control unit 250 generates management information regarding the recorded data (title), for example, a start / end address of a title, a capacity, and the like, and records it in the navigation area.

When the data recording is requested in the CLV mode, the control unit 250 obtains the last position information on which data is recorded from the area information managed in the memory 240 because the recording speed is constant in the inner or outer circumference of the optical disc. Data requested to be recorded from the last position information may be recorded in a form.

FIG. 7 is a flowchart illustrating a method of recording data on a disk according to an embodiment of the present invention. Referring to FIG. 6, the operation flow of FIG. 7 will be described.

The controller 250 removes the optical pickups 210, 220, and the signal processor 230, so that the management information recorded in the navigation area of the optical disc 100, that is, the disc 100 is removed. Information such as the start / end address of each title recorded in the data area, the address and the capacity of the recordable area, and the like are read out and stored in the memory 240 (S601).

When the controller 250 is requested to record a title recorded on a storage medium such as a hard disk on the optical disk 100 from a connected host or through an input unit (S602), the requested recording form or default recording is performed. If the recording form is checked by checking the form (S 603), the address of the recordable area is confirmed based on management information managed in the memory 240, and the requested data recording operation is performed by moving to the confirmed location. (S 604).

Of course, when the controller 250 is requested to record the title recorded on the storage medium, the controller 250 checks the capacity of the title requested to be recorded and records a space, that is, data, on the optical disc 100. Compared with the size of, it is possible to output a message informing that the recording requested capacity is larger than the space size and to ignore the recording request.

On the other hand, if the recording form is not a form or is, the control unit 250 checks the address of the location () of the recordable area from management information managed in the memory 240 and checks the title or request for recording therefrom. The address of the location () corresponding to the capacity of the data is calculated in reverse (S605).

The controller 250 controls the optical pickup 210 to move to the calculated position, and controls the optical pickups 210, 220, and the signal processor 230 from the moved position. In order to record the title requested to be recorded in the outer circumferential direction (S606), the recording speed may be increased sequentially or stepwise while proceeding to the outer circumference according to the recording style.

Of course, even if the recording form is or, upon the user's request, data may be recorded from the position of the recordable blank area.

When the requested recording is finished, the control unit 250 generates management information such as a start / end address, a capacity, and the like of the recorded title and records it in the navigation area (S 607).

On the other hand, in the rewritable disc, there may not be a continuous space (121 to 125 in FIG. 8) for recording data in accordance with recording and erasing of data. In this case, as shown in FIG. 8, the data requested to be recorded can be recorded in the area 124 located at the outermost periphery of one or more areas 121, 123, and 124 in which space is continuous over the requested data capacity. have.

In addition, in the second recording layer of the hierarchical disk, it proceeds from the outer circumference to the inner circumferential direction. When there is only a space for recording data in the second recording layer, the recording speed at the first position of the space for recording data is the best. Since it is fast, it is not necessary to move the recording start position to improve the data recording speed.

If the free space for recording data on the dual layer disc remains in the first recording layer and also in the second recording layer, the requested data can be recorded from the first position (most peripheral) of the second recording layer, or the first recording. If data is to be recorded in the layer at high speed, the data may be recorded in the circumferential direction from the recording capacity requested for recording and the recording start position obtained from the last address of the empty space of the first recording layer.

On the other hand, in the case of a disc that can be written once, such as a CD-R or DVD-R, only data is sequentially recorded from the inner circumference to the outer circumference, so that data can be recorded from the outer circumference with the empty space where no data is recorded in the inner circumference. Recording may not be allowed.

You can finish recording to a disc with a single data write to a disc that can be written to once (DAO: Disc at once), or you can write data multiple times (multi-session). You can leave it open for the next record without finalization. Each data recorded until recording starts and stops on a recordable disc is called a title or session.

Multi-session recording will be described taking DVD-R discs as an example. File system information about the entire title recorded on the disc when the title is first recorded in the data area, and a predetermined size, for example, R-zone # 1 of 6,000 sectors is allocated to the head of the data area and the disc is terminated. For example, UDF (Universal Disc Format) Bridge, VMGI (Video Manager Information), and the like are recorded in the R-zone # 1. Even if multiple titles are recorded on a disc, no data is recorded in R-zone # 1 until the disc is terminated.

When the first title is recorded in the data area of a DVD-R disc, R-zone # 1 is reserved (assigned) to be used for finalization of the disc, and R-zone # 2 to be used for recording information about title # 1 data. After the reserved R-zone # 1 is reserved with a predetermined size, for example, 100 sectors, and after R-zone # 3 is reserved in the area after the R-zone # 2, the R-zone # In 3, the user data of the title # 1 is recorded. After all the data is recorded in R-zone # 3, information about the title data recorded in R-zone # 3, for example, Video Title Set Information (VTSI), is generated and backed up at the end of R-zone # 3. And the VTSI is recorded again in the R-zone # 2.

Then, navigation information related to the first title recorded, for example, the start and / or end addresses of R-zone # 2 and R-zone # 3, and the end of R-zone # 2 and R-zone # 3 Information indicating whether or not is recorded in a recording management area (RMA) provided in the inner circumference more than the lead-in area.

Similarly, when the second title is recorded, data of the second title is assigned to R-zone # 5, which is allocated R-zone # 4 of a predetermined size after the R-zone # 3, and allocated to a region after R-zone # 4. Is recorded. The process after all the data has been recorded in R-zone # 5 is the same as for the first title.

Therefore, in order to record data from the desired recording start position of the outer periphery, the area from the end address of the last title already recorded in the data area to the recording start position is the area in which next data is to be recorded as one title (title #n). The data requested to be recorded from the recording start position can be recorded as title # (n + 1). At this time, the navigation information related to the title #n, for example, the start address of the R-zone # (2n) and R-zone # (2n + 1) and information indicating whether or not to end (set to indicate that the end has not been completed) ) Can be recorded in advance in the recording management area.

That is, a blank area between the position at which data was last recorded and the data requested to be recorded is reserved as one title for data to be recorded later, and the data requested to be recorded is reserved. The next title of can be recorded from the recording start position. As described above, the recording start position may be determined by the capacity of the data requested for recording and the last position of the data area.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

1 to 4 are diagrams showing that the data writing speed changes as the CLV, CAV, ZCLV, and PCAV modes progress from the inner circumference to the outer circumference, respectively.

5 schematically illustrates a disc recording method according to an embodiment of the present invention,

6 illustrates a configuration of a disk device to which the present invention is applied.

7 is a flowchart illustrating an operation of a method of recording data on a disc according to an embodiment of the present invention.

8 schematically illustrates a disc recording method according to another embodiment of the present invention.

※ Explanation of code for main part of drawing

100: optical disk 200: disk device

210: optical pickup 220: servo unit

230: signal processor 240: memory

250: control unit

Claims (20)

Confirming a capacity of data requested for recording; Calculating a recording start position from the predetermined position of the disc in reverse from the determined capacity; And And recording the data requested for recording from the calculated position. The method of claim 1, And recording the management information for the recorded data in a navigation area when the recording is completed. The method of claim 2, And the management information includes a first position and a last position of an area in which the data is recorded. The method of claim 1, And said predetermined position is the last position of the recordable space of said disk. The method of claim 1, And said predetermined position is the last position of the region located at the outermost periphery of one or more regions where recordable space is continuous over the identified capacity. The method according to claim 4 or 5, And reading out the last position from the navigation area of the disc and storing the last position in a memory. The method of claim 1, And the calculating step is performed when the recording mode is a mode in which the recording speed increases as the recording proceeds. The method of claim 7, wherein The recording mode is any one of CAV, ZCLV, and PCAV. The method of claim 1, And when the recording is requested in a mode in which the recording speed is constant, recording the data requested for recording from the first recordable position. The method of claim 1, And reserving a blank space between the last position of the data already recorded on the disc and the recording start position as a title for the data to be recorded later. The method of claim 10, And the reserving step comprises recording in the navigation area the initial position of the reserved title and information indicating that the reserved title is not over. The method of claim 10, And the data recorded from the calculated position is managed as a next title of the reserved title. A recording / reproducing unit for recording data on the disc or reading and reproducing the data from the disc; A memory for storing management information read from the disk; And And a control unit for controlling the recording / reproducing system, The controller checks the capacity of the data requested to be recorded, calculates a recording start position from the predetermined position of the disc in reverse from the predetermined position, and records the data requested to be recorded from the calculated position. Disk recorder. The method of claim 13, And the controller generates management information on the recorded data and records the navigation information in a navigation area when the recording is completed. The method of claim 13, And the predetermined position is the last position of the recordable space of the disc or the last position of the region located at the outermost periphery among one or more regions where the recordable space continues at least the identified capacity. The method of claim 13, And the control unit calculates the recording start position only when the requested recording mode is a mode in which the recording speed becomes faster as recording proceeds. The method of claim 13, And the controller records the requested data from the first recordable position when the recording is requested in a mode in which the recording speed is constant. The method of claim 13, And the control unit reserves an empty space between the last position of data already recorded on the disc and the recording start position as a title for data to be recorded later. The method of claim 18, And the control unit records in the navigation area the first position of the reserved title and information indicating that the reserved title is not finished. The method of claim 18, And the control unit manages data recorded from the calculated position as a next title of the reserved title.

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