KR20090051815A - Method for safely recording data on storage in hdd-dvd system - Google Patents

Abstract

The present invention relates to an HDD-DVD system. That is, in the present invention, in the recording method in the HDD-DVD system, when an overflow occurs in the internal SDRAM memory due to a delay in the recording operation, the recording operation may be continued by clearing one or two frames of data buffered on the SDRAM. In this case, the write operation can be performed more stably by preventing abnormal writing errors due to overflow on the internal SDRAM memory.

HDD, DVD, Record, SDRAM, Overflow

Description

Recording control method in HDD-DVD system {METHOD FOR SAFELY RECORDING DATA ON STORAGE IN HDD-DVD SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital versatile disk (DVD) system, and more particularly, when an overflow occurs in internal memory when recording image data input from a broadcast program or an external storage device in an HDD-DVD system having a hard disk drive (HDD). The present invention relates to a recording control method in an HDD-DVD system capable of stably performing a recording operation.

In general, a DVD recording / reproducing system refers to an apparatus for reproducing and displaying data recorded on an optical disc such as a DVD or HD-DVD, in which high-density data is recorded, compared to a compact disc (CD). DVD titles produced to be reproduced in the DVD can be recorded at a higher density than CDs, and have various functions as compared to conventional video media by various additional data as well as image quality.

Recently, video recording / reproducing devices such as HDD-DVD including HDD are being developed to record video data such as TV in large capacity. Among them, HDD type HDD-DVD system including HDD is installed in a loader. In addition to the ability to play multiple DVD discs, the DVD-RW can be backed up to DVD-RW discs loaded with the loader using the DVD-RW function for video data that needs to be backed up from the large-capacity video data stored on the HDD. The demand is on the rise.

On the other hand, in the HDD-DVD system as described above, the size of the synchronous dynamic random access memory (SDRAM) memory that temporarily stores data before storing to a DVD or HDD may be reduced in order to reduce cost. However, when the size of the SDRAM memory is reduced in order to reduce costs as described above, an internal retry occurs during data writing, and a write error occurs when an overflow occurs in the SDRAM memory.

That is, as shown in Fig. 1, when the unprocessed data on the SDRAM is stored up to 90% of the memory where the overflow occurs, the write data is continuously input and the overflow occurs on the SDRAM. -The DVD system abnormally stopped the recording operation, causing a recording error.

Accordingly, the present invention is to prevent a recording error due to an overflow on the internal memory when recording the video data input from the broadcast program or the external storage device in the HDD-DVD system, and to prevent the recording error in the recording operation in the HDD-DVD system. The present invention provides a recording control method in an HDD-DVD system that can stably perform a recording operation even when an overflow occurs.

According to the present invention, in the recording control method in the HDD-DVD system, buffering the requested input data on the internal buffer memory, recording the buffered input data on the recording medium, and performing the recording And checking whether an overflow occurs in the internal buffer memory, and clearing the internal buffer memory when the overflow occurs, and then performing writing again.

In the present invention, in the recording method in the HDD-DVD system, when an overflow occurs in the internal SDRAM memory due to a delay in the recording operation, the recording operation is continued by clearing one or two frames of data buffered on the SDRAM. Accordingly, there is an advantage that the write operation can be performed more stably by preventing the occurrence of abnormal writing error due to the occurrence of overflow on the internal SDRAM memory.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the present invention. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

In the present invention, in the recording method in the HDD-DVD system, in the case where an overflow occurs in the internal SDRAM memory due to a delay in the recording operation, the data of one or two buffered buffers on the SDRAM is cleared. It is easy to achieve what is intended in the present invention through a technique that allows the write operation to continue.

FIG. 2 is a schematic block diagram of a HDD-DVD system incorporating an HDD to which an embodiment of the present invention is applied. Hereinafter, with reference to FIG. Operation in each component for operation will be described in detail.

2, the digital signal processor (DSP) unit 206 adds additional data for an error correction code (ECC) to the encoded data and modulates the data according to a predetermined modulation scheme.

The RF amplifier 204 amplifies the electrical data input from the DSP unit 206 and converts it into an optical signal. The pickup unit 202 includes an actuator for focusing and tracking, and records the optical signal converted by the RF amplifier 204 on a disc.

The servo unit 208 receives the information necessary for servo control from the DSP unit 206 through the RF amplifier unit 204 and the control unit 212 to perform stable servo. The control unit 212 controls the overall operation of the entire system and the DVD disc 200 through the DSP unit 206, the RF amplifier 204, and the pickup unit 202 according to the user's key input through the key input unit 214. Record the data in).

Next, during reproduction, the pick-up 202 reads out an optical signal from the DVD disk 200 storing data. The RF amplifier 204 converts the optical signal output from the pickup unit 202 into an electrical signal and extracts a servo signal and modulated data for performing servo.

The DSP unit 206 demodulates the data modulated by the RF amplifying unit 204, performs ECC, removes additional data while correcting an error, and the pickup unit 202 according to the actuator up / down command of the controller 212. A signal for driving the lens actuator is generated. The servo unit 208 receives the information necessary for servo control from the RF amplifier 204 and the controller 212 and performs stable servo.

The HDD recording / reproducing unit 216 converts the input image data signal under the control of the control unit 212 into a hard disk recording format and records the same in the HDD 218. The SDRAM 210 is an internal buffer memory of the HDD-DVD system. The SDRAM 210 temporarily stores data input and decoded from a specific broadcast program or an external storage device to be recorded on the DVD disk 200 or the HDD during a recording operation.

The control unit 212 controls the overall operation of the entire DVD system and controls the DSP unit 206, the RF amplifier 204, and the pick-up unit 202 according to a user's key input. Data is recorded or data is reproduced from the DVD recording / playback disc 200. In addition, the controller 212 does not secure a minimum recordable area on the SDRAM 210 memory during data recording on a DVD or HDD according to an exemplary embodiment of the present invention, and when the recording retry occurs, the SDRAM 210 memory By checking whether or not a phase overflow occurs, and when an overflow occurs in the SDRAM 210 memory, the input data buffered in the SDRAM 210 memory is forcibly cleared so that a write error does not occur.

3 is a flowchart illustrating a process of completing a recording operation without an error when an overflow occurs during the recording operation in the HDD-DVD system according to an exemplary embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

First, the controller 212 of the HDD-DVD system waits for a user's command through the key input unit 214 when the power is turned on (S300). Accordingly, the user inputs a recording command when there is a broadcast program to be recorded through the key input unit 214 or specific image data stored in an external storage device.

Then, in response to the user's recording command key input in step S302, the controller 212 transmits to the specific broadcast program data or external storage device requested to be recorded on the DVD disc 200 or the HDD 218 in step S304. The recording operation for the specific stored image data is started.

Subsequently, the controller 212 proceeds to step S306 and checks whether an underflow occurs in the SDRAM 210 memory in which the image data is temporarily buffered and stored during the recording operation.

The underflow indicates that the amount of data input for recording on the DVD disc 200 or the HDD 218 and buffered on the SDRAM 210 is less than the minimum capacity for the recording operation. If an underflow has occurred, the control unit 212 proceeds to step S308 to control to temporarily hold a recording operation of an optical pick up (OPU) 202 which is driven during actual data recording. do.

However, in contrast, when data of the minimum capacity for the write operation on the SDRAM memory is input, the control unit 212 proceeds from step S306 to step S310 to control the operation of the pickup unit 202 to control the HDD-DVD. A recording operation is performed to record the input data buffered on the SDRAM 210 onto the DVD disk 200 or the HDD 218 in the system.

On the other hand, during the recording operation of the image data on the DVD disk 200 or HDD 218 as described above, the data input speed at which the data recording operation on the DVD disk 200 or HDD 218 is input onto the SDRAM 210 memory. It may be slower and overflow of data on the SDRAM 210 memory may occur.

In this case, as described above, when an overflow of data on the SDRAM 210 memory occurs, a recording error occurs because the recording operation on the DVD disc 200 or the HDD 218 is abnormally terminated.

Accordingly, in the present invention, when an overflow occurs in the SDRAM 210 memory as described above, the buffered data stored in the SDRAM 210 memory is forcibly cleared so that the recording operation of the HDD-DVD system is not stopped. In this case, on the SDRAM 210, image data of one or two frames may be lost depending on the capacity of the SDRAM 210 memory. However, loss of image data of one or two frames may be caused by the user. The data is so small that the difference is hardly noticeable, and if such data loss is to be taken, it is possible to prevent the writing error of the entire data.

That is, the controller 212 checks whether an overflow on the SDRAM 210 memory occurs due to a delay in the write operation in step S312, and then checks that an overflow on the SDRAM 210 memory occurs. In this case, the process proceeds to step S314 to forcibly clear the SDRAM 210 memory to prevent the recording operation of the HDD-DVD system from being stopped.

However, in contrast, when no overflow occurs in the SDRAM 210 memory, the controller 212 proceeds from step S312 to step S316 to normally perform a recording operation on the DVD disc 200 or the HDD 218. Let's do it.

As described above, in the present invention, in the recording method in the HDD-DVD system, when an overflow occurs in the internal SDRAM memory due to the delay of the write operation, the write operation is continued by clearing data of one or two frames buffered on the SDRAM. By implementing it, the write operation can be performed more stably by preventing the occurrence of an abnormal write error due to an overflow on the internal SDRAM memory.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

1 is a diagram illustrating an underflow and overflow area in a conventional SDRAM;

2 is a schematic block diagram of an HDD-DVD system to which an embodiment of the present invention is applied;

3 is a flowchart of a stable data recording operation control in the HDD-DVD system according to an exemplary embodiment of the present invention.

<Brief description of the major symbols in the drawings>

200: DVD disc 202: pickup portion

204: RF amplifier 206: DSP unit

208: Servo unit 210: SDRAM

212 control unit 214 key input unit

216: HDD recording / playback unit 218: HDD

Claims (2)

Buffering the write-requested input data onto an internal buffer memory; Recording the buffered input data on a recording medium; Checking whether an overflow occurs in the internal buffer memory during the writing; Clearing the internal buffer memory when the overflow occurs, and then performing a write again Recording control method in the HDD-DVD system comprising a. The method of claim 1, The internal buffer memory, Recording control method in the HDD-DVD system, characterized in that the SDRAM.

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