JPH05274801A - Data write control device of data recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the data write control device of a data recording and reproducing device which is capable of simplifying the format operation for the data sector to be generated by a data split and the rewriting processing of the ID information of each data sector and efficiently performing a formating as a result when the formating is performed for a disk of CDR system. CONSTITUTION:A HDC U writes the first ID information in the ID information which is included in each data sector and is to be recorded for the only number preliminarily set between servo areas by a prescribed timing from the time of the generation of an index pulse IP or a sector pulse SP. The next ID information is written by the timing after prescribed time passes from the write timing of the previous ID information and is executed based on each ID information in which the data write operations other than the ID information corresponding to each data sector are tecorded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data write control device for a data recording / reproducing device, such as a hard disk device, which employs a data recording method based on the CDR method and an embedded servo method.

[0002]

2. Description of the Related Art Conventionally, in a hard disk device, as shown in FIG. 8, a disk as a recording medium has a plurality of tracks TR1 to TR3 arranged concentrically, and each track further has a plurality of sectors (0. ~ 7). Data access (recording / reproduction) to / from the disk is performed by this sector unit.

Furthermore, an embedded servo system called an embedded servo system is also used.
In the method, servo information is recorded on the disc at predetermined intervals. The servo information is information for controlling the positioning of the head for recording / reproducing data. In each of the tracks TR1 to TR3, a sector area is an area between servo areas in which servo information is recorded.

By the way, in the data recording method as shown in FIG. 8, since the same number of sectors are arranged in each track, the data recording density of each sector is different between the outer peripheral side and the inner peripheral side of the disk. In contrast to such a system, a constant density recording system (co-disc) is used in which the number of sectors on the outer circumference side of the disc is increased and the number of sectors on the inner circumference side is reduced to make the data recording density of each sector constant.
nstdensity recording (hereinafter CDR method) has been developed.

In the CDR system, as shown in FIG. 7, for example, tracks TR0 and TR1 on the outer peripheral side of the disc are provided with sectors 0 to 9 and the track T on the inner peripheral side of the disc is arranged.
Sectors 0 to 7 are arranged in R2 and TR3. In this case, the tracks (TR0 and TR1 or TR2 and TR3) belonging to the same zone have the same number of sectors.

Further, each track TR0-TR3 has a format structure divided by a servo sector including a servo area of 1 unit in which servo information is recorded and a data sector of 1 unit. Each track has the same number of servo sectors. The data sector is roughly divided into ID information and a normal data area (user data area) DATA.

When performing the formatting by the CDR method, as shown in FIG. 6, first, the index pulse IP is detected, the first servo area S1 is waited for by the rotation of the disk, and the I of the data sector 0 is read.
The D information and the normal data area DATA are written. When the write operation of the data sector 0 is completed, a predetermined gap is secured and the write operation of the data sector 1 is continuously started. At this time, as shown in FIG. 6, since the next servo area S2 exists in the data area (hatched portion), the passage of the servo area S2 is waited for in synchronization with the detection of the sector pulse SP. That is, the data area of a predetermined range is written until just before the servo area S2, and the remaining data area is written after the servo area S2.

The state where the data area of the data sector is divided by such a servo area is called data split. Specifically, as shown in FIG. 5, a data area DATA having a data length of 512 bytes in the data sector 1 causes a data split at the 256th byte due to the servo area S2.

[0009]

When formatting is performed by the CDR method, a data split in which a data area is divided by a servo area may occur in a data sector. In the data sector where the data split occurs, complicated control is required before and after the servo area, such as executing, stopping, and executing the data write operation in the format operation. Further, since the writing operation of the ID information of each data sector depends on the write timing of the previous data sector,
When rewriting information, a process of calculating the writing start position is necessary.

An object of the present invention is to simplify a formatting operation for a data sector in which a data split occurs and a rewriting process of ID information of each data sector when formatting a CDR type disk, and as a result, formatting is performed. Another object of the present invention is to provide a data write control device for a data recording / reproducing device which can improve the efficiency of the above.

[0011]

According to the present invention, in a data write control device of a data recording / reproducing device for formatting a recording medium by a CDR system, a standard required for a formatting operation based on servo information reproduced from a servo area. The apparatus is provided with a reference pulse detecting means for outputting a pulse and a data writing control means for writing each ID information contained in each data sector at a predetermined timing.

[0012]

According to the present invention, the data write control means sets the first ID information among the ID information recorded in a predetermined number of servo areas included in each data sector from the time when the reference pulse is generated. Write at a predetermined timing, then write I
Each I in which data writing operation other than ID information corresponding to each data sector is recorded by writing at a timing after a predetermined time has elapsed from the writing timing of previous ID information from D information
Perform based on D information.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a hard disk device (HDD) which is a data recording / reproducing device according to the embodiment. The HDD 1 includes a disk rotating mechanism 2, a carriage mechanism 3, a disk controller (HDC) 4,
It has a microprocessor (CPU) 5 and a buffer memory 6.

The disk rotating mechanism 2 has a spindle mechanism 8 for fixing the disk 7 as a recording medium and rotating the disk 7 by the rotational force of a motor 9. The carriage mechanism 3 includes a head 10 corresponding to each recording surface of the disk 7.
And a seek to the target track of the disk 7 under the control of the HDC 4.

The HDC 4 is a constituent element of the present invention, constitutes an interface with a host computer (host system) 11, controls the carriage mechanism 3, controls read / write with respect to the head 10, and accesses the buffer memory 6. It is a control unit that executes control. The HDC 4 executes the CDR format formatting according to the present invention.

The CPU 5 controls the HDC 4 based on a program prepared in advance and outputs various control information necessary for its operation. Under the control of the HDC 4, the buffer memory 6 reads data in sector units read from the disk 7 or the host computer 11 reads the disk 7 from the disk 7.
It is a memory for storing write data to be recorded in.

The head 10 is a read / write (R / W)
Based on the write data from the circuit 13, the data write operation to the disk 7 is executed. The R / W circuit 13 outputs read data corresponding to the read signal read by the head 10 to the HDC 4. The servo circuit 12 is a circuit for reproducing the servo information read by the head 10, and has a function of detecting the index pulse IP and the sector pulse SP according to the embodiment.

Here, in the present invention, as shown in FIG.
A disk 7 formatted by the CDR method is used. As described above, the disk 7 has each track TR.
The configuration is such that 0-TR3 is divided by a servo sector including a servo area and a data sector.

As shown in FIG. 4A, the servo area has an AGC signal area 20, which is a synchronizing signal portion, an erase area 21, a cylinder code area 23, and a bust data area 24. Furthermore, erase area 2
A signal pattern area 22 for detecting the index pulse IP or the sector pulse SP is provided between 1 and the cylinder code area 23. The cylinder code area 23 is an area in which a cylinder code indicating a cylinder number (track number) is recorded. The bust data area 24 is an area in which positioning information for positioning the head 10 at the center of the track is recorded. The above information recorded in the servo area is collectively referred to as servo information.

As shown in FIG. 4B, the data sector is roughly classified into an ID area 25 in which ID information is recorded, a normal data area (DATA) 26, and an I of the next data sector.
It has a gap (GAP) 27 with the D region. Next, the operation of the embodiment will be described.

Upon receiving the formatting instruction for the disk 7 from the host computer 11, the HDC 4 controls the carriage mechanism 3 to cause the head 10 to seek a designated track (designated cylinder). Head 10
Servo information is read from the designated track on which the disk 7 is rotating and is positioned.

The servo circuit 12 extracts the cylinder code, index pulse IP or sector pulse SP from the servo information read from the head 10 and outputs it to the HDC 4. HDC4 uses a cylinder code for the head 10
It is determined whether or not is located on the designated track. By index pulse IP or sector pulse SP,
The servo sector in which the head 10 is located is determined.

Further, the HDC 4 outputs a write control signal called a write gate WG to the R / W circuit 13 as the timing of the data write operation. R / W circuit 1
Reference numeral 3 is write data (ID information and normal data DATA) output from the HDC 4 in synchronization with the write gate WG.
A write signal according to the above is output to the head 10.

In such a basic operation, when the servo circuit 12 outputs the index pulse IP based on the servo information read from the head 10, the HDC 4 recognizes that the servo area S1 of the servo sector 0 is detected, Formatting of sector 0 is started (YES in step S1). Here, the servo circuit 12
Identifies the index pulse IP or the sector pulse SP according to the signal pattern recorded in the signal pattern area 22 of the servo area. Index pulse IP
Is one pulse for each rotation of the disk 7 in response to the detection of the head of each track. Other than this, the sector pulse SP is generated in response to the detection of the servo area.

As shown in FIG. 2, the HDC 4 outputs the write gate WG to the R / W circuit 13 after a lapse of a predetermined time T1 from the time when the index pulse IP is generated. R
The / W circuit 13 synchronizes with the write gate WG,
A write signal corresponding to the write data which is the ID information (ID0 of data sector 0) output from the head 10 is output to the head 10. As a result, as shown in FIG. 2, ID0 of the data sector 0 is written (step S2).

When the write operation of ID0 is completed (YES in step S3), the HDC 4 continuously writes the ID information (ID1) of the next data sector 1 after the elapse of a predetermined time T2 from the end of this write operation. The operation is started (step S4). When this writing operation of ID1 is completed (YES in step S5), the HDC 4 causes the servo circuit 1 to operate.
It waits until the sector pulse SP is output from 2 (step S6).

Here, the number of ID areas to be recorded is preset between one unit of servo sector (for example, sector 0). This is determined according to the number of data sectors assigned to each track.

The head 10 waits for the disk 7 to rotate,
When the next servo area S2 is detected, the servo circuit 12 detects the sector pulse S based on the servo information from the head 10.
P is output to the HDC 4 (YES in step S6). H
DC4 has a predetermined time T from the time of generation of the sector pulse SP.
After the lapse of 1, the write gate WG is output to the R / W circuit 13. As a result, the head 10 writes the ID information of the data sector n (here, n = 2) (step S
7). When the write operation of the ID information of the data sector n is completed (YES in step S8), the HDC 4 continues to the next data sector n + 1 (here, n = 3) after a predetermined time T2 has elapsed from the end of the write operation. The ID information writing operation is started (step S9).

When the HDC 4 finishes the write operation of the ID information for all the data sectors of one track or all the data sectors of each track (YES in step S12).
The write operation of the normal data DATA of each data sector is started. As shown in FIG. 4B, the ID information has a cylinder number, a head number, and a sector number. The HDC 4 performs the write operation of the normal data DATA corresponding to the data sector based on the sector number of the ID information read by the head 10.

As described above, in the data recording method by the CDR method, the writing operation of the ID information of each data sector and the other data (normal data DATA) is divided at the time of the formatting operation for the disk 7. That is, the ID information is first written, and then the writing operation of other data is started. At this time, the ID information is written between the servo areas at a predetermined timing with reference to the index pulse IP or the sector pulse SP detected based on the servo information from each servo area corresponding to the head portion of the servo sector.

Therefore, by the CDR method, even if a data split (data sector 1 shown in FIG. 2) in which a data area is divided by a servo area occurs in the data sector, the ID information write operation is always performed at a constant timing. Can be controlled by. In other words, perform the data write operation before and after the servo area,
Without the need for complicated controls such as stop and run,
The write operation can be executed by a predetermined method based on the index pulse IP or the sector pulse SP. Further, since the write start position of each ID information is determined based on the index pulse IP or the sector pulse SP,
The format of a specific data sector can be rewritten relatively easily. That is, when rewriting the ID information as in the conventional case, the process of calculating the write start position based on the positions of other data sectors is not necessary.
The write start position can be determined based on the detection of the index pulse IP or the sector pulse SP.

[0033]

As described in detail above, according to the present invention, C
In the data recording / reproducing apparatus of the DR system, the writing operation of the ID information and the other information is divided during the formatting operation, and the ID information is written based on the reference pulse from the servo information. Therefore, it is possible to realize a reliable formatting operation for each data sector without requiring particularly complicated write control for the data sector in which the data split occurs. Further, the rewriting process of the ID information of each data sector can be simplified. This results in C
The efficiency of DR format formatting can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a hard disk device according to an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation according to the embodiment.

FIG. 3 is a flowchart for explaining the operation of the embodiment.

FIG. 4 is a conceptual diagram for explaining a format of a disc according to the embodiment.

FIG. 5 is a conceptual diagram for explaining a conventional CDR format.

FIG. 6 is a timing chart for explaining a conventional CDR format.

FIG. 7 is a conceptual diagram for explaining a conventional CDR type disc.

FIG. 8 is a conceptual diagram for explaining a conventional normal disc.

[Explanation of symbols]

1 ... HDD, 4 ... HDC, 7 ... Disk, 10 ... Head, 11 ... Host computer, 12 ... Servo circuit, 1
3 ... Read / write circuit.

Claims (2)

[Claims] 1. A recording medium, in which tracks are divided at predetermined intervals by servo areas in which servo information is recorded,
In a data recording / reproducing apparatus for recording data on the recording medium by a constant density recording method, a reference pulse necessary for a formatting operation on the recording medium is output based on the servo information reproduced from the servo area. When a data sector is formed on the recording medium by the reference pulse detecting means and the format operation, a predetermined number of data is recorded between the servo areas included in each data sector.
Among the D information, the first ID information is written at a predetermined timing from the time when the reference pulse is generated, the next ID information is written at a timing after a predetermined time has elapsed from the writing timing of the previous ID information, and each data is written. I corresponding to the sector
A data write control device for a data recording / reproducing apparatus, comprising: a data write control means for executing a data write operation other than D information based on the recorded ID information. 2. A data recording / reproducing apparatus of a constant density recording system, which uses a recording medium having a format in which a servo area in which servo information is recorded and a servo sector including one unit of a data sector is used. Pulse detecting means for detecting an index pulse or a sector pulse necessary for a formatting operation on the recording medium based on the servo information reproduced from the data recording medium, when the data sector is formed on the recording medium by the formatting operation. I recorded in a predetermined number between the servo areas included in each sector
Among the D information, the first ID information is written at a predetermined timing from the time when the index pulse or the sector pulse is generated, and the next ID information is written at a timing after a predetermined time has elapsed from the writing timing of the previous ID information, ID information writing means for writing ID information corresponding to at least one track of all data sectors, and data writing operation other than ID information corresponding to each data sector after the ID information writing means has finished writing the ID information A data write control device for a data recording / reproducing device, comprising: