JPH08147878A - Optical disk recorder - Google Patents

Abstract

PURPOSE: To reduce the probability that buffer empty occurs on the way of recording when the data sent from a host computer are received by a buffer memory, and interleaving is performed for every prescribed unit section whose size is variable or fixed, and plural unit sections are recorded continuously in an optical disk recorder additionally writing the data by a CD-WO standard. CONSTITUTION: A sequence controller 24 decides whether or not the whole data of a next packet are stored in a data buffer 14 and whether or not a data amount of a prescribed data write successive ratio or above is stored at the timing of this side of a next packet while plural packets are recorded continuously. Then, when any one side condition is satisfied, the next packet is recorded continuously, and when neither conditions are satisfied, recording operation is interrupted temporarily when the former packet ends, and after any one condition is satisfied, the recording operation after the next packet is re-opened from an interrupted position again.

Description

Detailed Description of the Invention

[0001]

This invention relates to a CD-WO (CD
Regarding an optical disc recording apparatus for additionally writing data in the Write Once standard, a buffer memory receives data sent from a host computer, and the data is interleaved for each predetermined unit section of which size is variable so that a plurality of unit sections are formed. This is to reduce the possibility of buffer empty (empty of the buffer memory) during recording when recording continuously.

[0002]

2. Description of the Related Art In general, a CD-WO disc recording system receives data (host data) transferred from a host computer 10 in a buffer memory 14 of an optical disc recording device 12 as shown in FIG.
(CD-WO disc). The buffer memory 14 sequentially reads new data transferred from the host computer 10 at the time of recording, and sequentially reads old data at a constant clock and writes the old data on the optical disc 16.

The recording format of CD-WO is one track (one group of data, which is called CD-DA (CD Di
In the case of "Gal Audio", it corresponds to one song. ) Is written at a stroke, and there is an incremental write that writes in the track in "packet" units. In addition, the incremental light has 1
The packet size (data amount) may be fixed or variable. Track-at-once records a track as one unit, as shown in FIG. The format of the track is Run-o
ut (RO), Link, and Run-in (RI) are provided, and Pre- is provided between Run-in and Run-out.
Gap and user data (User Data: UD) are provided. Incremental light is shown in Figure 3.
As shown in (b), the packet is recorded as one unit. The packet format is provided with Run-out, Link, and Run-in as a write-once period, and user data is provided between Run-in and Run-out.

Of these formats, the user data is data (host data) transferred from the host computer 10. Link, Run-in, Pre
-Gap and Run-out are generated in the optical disc recording device 12. The Link is a portion that is crushed by rewriting and is provided in one sector. Run-in is an approach section of a servo for receiving user data, and is provided with 4 sectors (RI-1 to RI-4). Run-
out is a CIRC (Cro
ss Interleaved Reed-Solomo
(n Code) interleaved and distributedly recorded, it is for recording the dispersed data without applying the Link.
O-2) is provided. As the Pre-gap, the Track Description generated in the disc recording device is used.
Ion Block is written.

In user data, as shown in FIG. 4, one sector (= frame) is composed of 98 EFM frames (1 EFM frame is 24 bytes), and a maximum of 10 data of 1 EFM frame is obtained by interleaving by CIRC.
It is distributed and recorded up to 8 EFM ahead. Therefore, the data of the last sector of the user data is recorded up to the second sector of Run-out (RO-2).

[0006]

In the system in which the data transferred from the host computer 10 is received by the buffer memory 14 and recorded on the optical disk 16 as shown in FIG. 2, a plurality of unit sections (tracks or packets) are provided.
When continuously recording, the transfer speed from the host computer 10 to the buffer memory 14 and the buffer memory 14
If the discharge speed of the data from the memory is balanced, the amount of data in the buffer memory 14 is always constant, but if the data processing speed of the host computer changes (the discharge speed from the buffer memory 14 is always constant), The data amount of the buffer memory 14 also changes. Then, when the data processing speed of the host computer 10 is delayed, the amount of data in the buffer memory 14 gradually decreases, and when all the data is discharged, the buffer memory 14 becomes empty and enters a so-called buffer empty state. .

In this case, in the case of a recording system that does not perform interleaving, such as a hard disk drive, FIG.
Since the logical sector of the host data and the physical sector of the data recorded on the disk have a one-to-one correspondence as in (a), even if the buffer empty occurs in the fifth sector (UD-5), for example, After the data of 6 sectors (UD-6) and after is accumulated in the buffer memory, the end position of the 5th sector (UD-5) can be sought and the data after 6th sector can be rewritten.

However, the interleaved CD-W
In the O system, the logical sector before recording (before interleaving) and the physical sector after recording (after interleaving) do not have a one-to-one correspondence as shown in FIG. 5B. Therefore, for example, even if the buffer empty occurs in the fifth sector (UD-5), the data in the fifth sector (UD-5) must be continuously written up to two sectors ahead (up to RO-1). Then, even if the data of the sixth sector (UD-6) is stored in the buffer memory 14 and can be written in the disk 16 thereafter, the positions on the disk corresponding to the logical sectors UD-6 and RO-1 are already added. Since it is already done, the data of the sixth sector (UD-6) can no longer be written from the position of the logical sector UD-6, and in the worst case, the disc itself may be invalid.

The present invention solves the above-mentioned problems in the prior art, receives the data sent from the host computer in a buffer memory, and interleaves the data in predetermined unit intervals of variable size. CD-W
It is an object of the present invention to provide an optical disk recording apparatus that reduces the possibility that buffer empty will occur during recording in the case of write-once recording in the O standard.

[0010]

According to the first aspect of the present invention,
Data to be recorded is input from a host computer, and a variable size or fixed size data is formed into a predetermined format of the CD-WO standard through a buffer memory and interleaved for each data of the unit section. An optical disc recording apparatus for continuously recording data of a plurality of unit sections by performing the following, and while recording data of a plurality of unit sections continuously, a unit next to the unit section being recorded is recorded. At a timing before the recording of the data of the section is started, it is judged whether or not a data amount of a fixed reference value or more is stored in the buffer memory, and if it is stored, the data of the next unit section is The data is recorded continuously from the data of the previous unit section, and if it is not stored, the recording operation is suspended and fixed when the recording of the data of the previous unit section is completed. A recording sequence controller having a recording sequence for restarting the recording operation after the next unit section from the interruption point after waiting for the data amount of the reference value or more to be stored in the buffer memory. is there.

According to a second aspect of the present invention, data to be recorded is input from a host computer, and a CD is used for each data of a predetermined unit section whose size is variable via a buffer memory.
An optical disc recording apparatus which continuously records data of a plurality of unit sections by forming a predetermined format of WO standard and interleaving each data of the unit section, and continuously recording data of the plurality of unit sections. During recording, the amount of data equal to or larger than the size of the next unit section is stored in the buffer memory at a timing before the recording of the data of the unit section next to the unit section being recorded is started. If it is stored, the data of the next unit section is recorded after the data of the previous unit section, and if it is not stored, the recording of the data of the previous unit section is finished. At that point, the recording operation is temporarily suspended, and after waiting for a data amount equal to or larger than the reference value determined according to the size of the next unit section to be stored in the buffer memory, Is made of comprises a recording sequence controller having a resume recording sequence the next unit interval after the recording operation from the point.

According to a third aspect of the present invention, data to be recorded is input from a host computer, and a CD is stored for each data in a predetermined unit section of variable size via a buffer memory.
An optical disc recording apparatus which continuously records data of a plurality of unit sections by forming a predetermined format of WO standard and interleaving each data of the unit section, and continuously recording data of the plurality of unit sections. During recording, whether or not a data amount of a fixed reference value or more is stored in the buffer memory at the timing before the recording of the data of the unit section next to the unit section being recorded is started. And determining whether a data amount equal to or larger than the size of the next unit section is stored in the buffer memory,
If the amount of data that is greater than or equal to one of the reference values is stored, the data of the next unit section must be recorded after the data of the previous unit section, and the amount of data that is greater than or equal to any of the reference values must also be stored. For example, when the recording of the data of the unit section before that is finished, the recording operation is temporarily interrupted, and after waiting for the data amount of one of the reference values or more to be stored in the buffer memory, the recording operation is restarted from the interrupted point. It comprises a recording sequence controller having a recording sequence for restarting the recording operation after the next unit section.

[0013]

According to the first aspect of the present invention, when the data of a plurality of unit sections of variable size are continuously recorded, the recording sequence controller performs the unit section to be interleaved (1 packet in the case of incremental write, At the timing immediately before the recording of one track in the case of track-at-once) is started, it is detected whether or not the data amount of the fixed reference value or more is already stored in the buffer memory, and if it is stored, the recording is continued as it is. , If the data is not stored, the recording is interrupted, and the recording is restarted after the data amount of the fixed reference value or more is stored, so that the buffer empty occurs during the recording of the unit section. Less likely.

According to the second aspect of the present invention, when the data of a plurality of unit sections of variable size are continuously recorded, the timing immediately before the recording sequence controller starts the recording of the unit section to be interleaved. Detects whether or not a data amount equal to or larger than the size of the next unit section is already stored in the buffer memory, and if so, continues recording, and if not stored, interrupts recording and Since the recording is restarted after waiting for the data amount equal to or larger than the reference value determined according to the size of the unit section to be stored, the possibility that buffer empty will occur during the recording of the unit section is low. Become.

According to the third aspect of the invention, when the data of a plurality of unit sections of variable size are continuously recorded, the timing immediately before the recording sequence controller starts the recording of the unit section to be interleaved. , Whether the amount of data above the fixed reference value is already stored in the buffer memory, and whether the amount of data above the variable reference value, which is determined according to the size of the next unit interval, is already stored in the buffer memory. Is detected and if the data amount of one of the reference values or more is stored, the recording is continued as it is, and if the data amount of any one of the reference values is not stored, the recording is interrupted and Since the recording is restarted after waiting for the data amount more than the reference value to be stored, the buffer empty occurs during the recording of the unit section. Potential that is lower.

[0016]

An embodiment of the present invention will be described below. Here, a case will be described where incremental writing is performed with a variable packet size. In this case, one packet corresponds to a unit section.

FIG. 1 is a system configuration diagram of an optical disk recording system to which the present invention is applied. This system includes a host computer 10 and an optical disk recording device 12.
According to the agreement with the (CD recorder), whether or not to continuously record the packets can be set as an option, and here, it is assumed that the continuous recording mode is set.

The host computer 10 generates data to be recorded on the optical disk (user data), and continuously outputs a plurality of packets of data to the connection cable 20 via the interface section 18. Interface is S
CSI, IDE, etc. are used. The data sent through the connection cable 20 is input to the CD recorder 12 (optical disk recording device). With the CD recorder 12,
The input data is received by the interface unit 22 and sequentially stored in the data buffer 14 (buffer memory).

The amount of data contained in one packet may or may not be notified in advance by the information on the amount of data of the next packet sent from the host computer 10 prior to sending the data of that packet. is there. Host computer 10 if not notified
After the data transfer from the host computer 10 continues,
The data amount of the packet is first determined by inputting the command for instructing the end of the packet from the CD recorder 1
On the side of 2, the data amount of the packet is counted and confirmed. ).

In response to a command from the system controller 24, the data buffer 14 sequentially overwrites and stores new data to be input at an address where the oldest data is stored, and stores the data according to a constant clock. The data is sequentially read out from the oldest and output.
The data read out from the data buffer 14 is processed by the format forming and EFM modulating unit 26 into EDC (Err).
or Detection Code) or ECC (Er
error correction code) is added,
Also, Link, Run-in, and Run-out are added to form the packet format of FIG. 3B (the packet length is variable), and the data is EFM-modulated and output.
The EFM-modulated data is supplied to the optical head 30 through the servo controller 28. The laser diode modulation circuit (included in the servo controller 28) controls laser power (ALPC: Automatic Laser) in response to a command from the system controller 24.
Power Control), seek control, etc. are performed. Further, the laser power is switched according to the recording mode / reproduction mode.

In the recording mode, the optical head 30 receives the laser beam 32 whose recording power is set to E.
The signal is modulated by the FM signal and emitted, and pits are formed on the recording surface of the optical disc 16 to record the EFM signal. In the reproducing mode, the laser beam 32 set to the reproducing power is applied to the recording surface of the optical disc 16 to read the pits.

The data amount detector 34 detects the amount of data stored in the data buffer 14 (the amount of data that has been read but not yet read) at any time during the recording mode. This data amount can be detected, for example, as the difference between the read address and the write address of the data buffer 14. The system controller 24
As a sequence controller, in the recording mode, the detection value of the data amount detection device 34 is monitored at a predetermined timing before the end of recording of each packet, and the variable reference value determined in the data buffer 14 according to the data amount of the next packet. It is detected whether or not the above data amount is stored and whether or not the data amount equal to or larger than a fixed reference value is stored. In this embodiment, the data amount of the next packet itself is used as the variable reference value, and the "write-once ratio" set to a value close to the total capacity of the data buffer 14 is used as the fixed reference value. The reason for using a fixed reference value together is
If only the data amount of the next packet is used as the reference value, when the data amount of the next packet is larger than the total capacity of the data buffer 14, there is a disadvantage that the recording interruption state is not resolved even if the data buffer 14 overflows. This is to prevent the occurrence.

The sequence controller 24 is shown in FIG.
As shown in (a), when the data amount of the next packet is larger than the data write-once ratio or when the data amount of the next packet is not yet determined, the data buffer 14 is set at the timing immediately before the end of the recording of the packet. If the amount of data stored in is less than the data write ratio, the recording operation is temporarily stopped at the end of recording of the current packet (a-1). If the ratio is higher than the data write-once ratio, the data of the next packet is continuously recorded without interruption (a-2).

The system controller 24 is shown in FIG.
As shown in (b), when the data amount of the next packet is smaller than the data write ratio, the data amount stored in the data buffer 14 at the timing immediately before the end of the packet recording is the data amount of the next packet. If the number is smaller than the above, the recording operation is temporarily stopped when the recording of the current packet is completed (b-1). If it is larger than the data amount of the next packet, the data of the next packet is continuously recorded without interruption (b-2).

Here, an example of sequence control by the sequence controller 24 in the recording mode will be described with reference to FIGS.
It shows in FIG. When a recording start command is issued (S1), it is confirmed that all the data of the first packet has been stored in the data buffer 14 or that the data write / write ratio has been reached (S2, S3, S4), and the recording operation is started. Start (S
5). During recording, it is judged whether or not the predetermined timing immediately before the end of each packet has been reached (S6). If not, the recording operation is continued (S7). When the predetermined timing is reached while continuing the recording operation, the data buffer 1
It is determined whether or not all the data of the next packet is stored in 4 and whether the data write ratio has been reached (S8, S9, S10), and if either one of the conditions is satisfied, the next packet is Continue recording (S1
1). On the other hand, if neither condition is satisfied, the recording operation is interrupted when the recording of the current packet is completed (S12). Then, it is judged whether or not the recording of all the packets is completed (S13), and when the recording of all the packets is completed, the recording operation is completed (S14). If recording of all packets has not been completed, wait for either one of the conditions to be satisfied (S15, S16, S1).
7) Then, the recording operation is restarted (S18).

FIG. 9 shows an example of actual recording by the sequence control of FIGS. In (i), the optical head 30 records the packet B after the packet A, and is about to finish recording the packet B. At this time, if the amount of data in the data buffer 14 is equal to or greater than the amount of data of the next packet or is equal to or greater than the data write ratio, the link structure of packet C is protected after the recording of packet B is completed without a seek operation for writing. Continue writing in a data structure.
On the other hand, when the amount of data in the data buffer 14 is not more than the amount of data of the next packet (including the case where the amount of data of the next packet is not fixed) and is not more than the data write ratio, ( As shown in ii), the recording is interrupted at the end of the packet B, waits for the data amount of the data buffer 14 to satisfy one of the conditions, and the seek operation is performed as shown in (iii) to perform the operation after the packet B. The packets after the packet C are rewritten.

[0027]

As described above, according to the first aspect of the invention, when the data of a plurality of unit sections of variable or fixed size is continuously recorded, the recording sequence controller performs interleaving. Immediately before the recording of the unit section is started, it is detected whether or not the data amount of the fixed reference value or more is already stored in the buffer memory, and if it is stored, the recording is continued as it is, and if it is not stored. Since the recording is interrupted and the recording is restarted after the data amount of the fixed reference value or more is stored, it is possible to reduce the possibility of the buffer empty during the recording of the unit section.

According to the second aspect of the present invention, when the data of a plurality of unit sections of variable size are continuously recorded, the timing immediately before the recording sequence controller starts the recording of the unit section to be interleaved. Detects whether or not the buffer memory has already stored a data amount that is greater than or equal to the variable reference value that is determined according to the size of the next unit section, and if so, continues recording and continues storing. For example, recording was interrupted, and recording was restarted after waiting for the data amount of the reference value or more determined according to the size of the next unit section to be stored.
It is possible to reduce the possibility that buffer empty will occur during recording of the unit section.

According to the third aspect of the invention, when the data of a plurality of unit sections of variable size are continuously recorded, the timing immediately before the recording sequence controller starts recording of the unit section to be interleaved. , Whether the amount of data above the fixed reference value is already stored in the buffer memory, and whether the amount of data above the variable reference value, which is determined according to the size of the next unit interval, is already stored in the buffer memory. Is detected and if the data amount of one of the reference values or more is stored, the recording is continued as it is, and if the data amount of any one of the reference values is not stored, the recording is interrupted and Since the recording is restarted after waiting for the data amount more than the reference value to be stored, the buffer empty occurs during the recording of the unit section. That possibility can be reduced.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of an optical disc recording system.

FIG. 3 is a diagram showing a recording format format of CD-WO.

FIG. 4 is a diagram showing a recording format of user data of a CD-WO system and a distribution state of user data by interleaving.

FIG. 5 is a diagram showing data rewriting when there is no interleaving.

FIG. 6 is a diagram showing a state in which data cannot be continuously written when interleaving is performed.

FIG. 7 is a flowchart showing an example of sequence control by the sequence controller 24 of FIG.

FIG. 8 is a flowchart showing a continuation of FIG.

FIG. 9 is a diagram showing an example of a recording operation by the sequence control of FIGS.

[Explanation of symbols]

10 host computer 12 CD recorder (optical disk recording device) 14 data buffer (buffer memory) 16 optical disk 24 system controller (sequence controller)

Claims (3)

[Claims] 1. A host computer inputs data to be recorded, and a variable size or fixed size data is formed into a predetermined format of a CD-WO standard through a buffer memory and the unit section is formed. Is an optical disc recording apparatus for continuously recording data of a plurality of unit sections by performing interleaving on each piece of data, and recording a unit of a unit being recorded while continuously recording data of a plurality of unit sections. At the timing before the recording of the data of the unit next to the section is started, it is judged whether or not a data amount of a fixed reference value or more is stored in the buffer memory, and if it is stored, the next unit is stored. The data of the section is recorded following the data of the previous unit section, and if it is not stored, the recording operation is temporarily stopped when the recording of the data of the previous unit section is completed. Suspend and wait for a fixed reference value or more of data to be stored in the buffer memory,
An optical disk recording apparatus comprising a recording sequence controller having a recording sequence for restarting the recording operation after the next unit section from the interruption point. 2. Data to be recorded is input from a host computer, and data of a predetermined unit section of variable size is formed into a predetermined format of the CD-WO standard for each data of a predetermined unit section via a buffer memory. An optical disc recording device for continuously recording data of a plurality of unit sections by performing interleaving for each unit, and recording data of a plurality of unit sections while recording data of a plurality of unit sections continuously. At a timing before the recording of the data of the next unit section is started, it is judged whether or not a data amount equal to or larger than the size of the next unit section is stored in the buffer memory. The data of the unit section is recorded following the data of the preceding unit section, and if it is not stored, the recording operation is restarted when the recording of the data of the preceding unit section is completed. The recording operation is interrupted, and the recording operation after the next unit section is restarted from the interruption point after waiting for the data amount of the reference value or more determined according to the size of the next unit section to be stored in the buffer memory. An optical disk recording apparatus comprising a recording sequence controller having a recording sequence for restarting recording. 3. Data to be recorded is input from a host computer, and data of a predetermined unit section of variable size is formed through a buffer memory into a predetermined format of the CD-WO standard for each unit section data. An optical disc recording device for continuously recording data of a plurality of unit sections by performing interleaving for each unit, and recording data of a plurality of unit sections while recording data of a plurality of unit sections continuously. Whether or not a data amount of a fixed reference value or more is stored in the buffer memory at a timing before starting recording of data of the next unit interval, and a data amount of more than the size of the next unit interval is stored in the buffer memory. It is judged whether the data is stored or not, and if the data amount equal to or more than one of the reference values is stored, the data of the next unit section is immediately Recording is continued after the data of the unit section, and if the data amount of any reference value or more is not stored, the recording operation is temporarily stopped when the recording of the data of the preceding unit section is finished, and one of the reference values An optical disk recording apparatus comprising a recording sequence controller having a recording sequence for restarting the recording operation after the next unit section from the interruption point after waiting for a data amount equal to or more than a value to be stored in the buffer memory. .