JPH07220419A - Data recording/reproducing device and sector pulse generation method - Google Patents

Abstract

PURPOSE:To provide a data recording/reproduction device which can increase access processing by continuously generating sector pulses without requiring time monitoring or rotation waiting when changing a head. CONSTITUTION:A sector pulse decoder 9b decodes servo data read by a head H and generates servo sector pulses SSP1 and SSP2 for detecting an index pulse IP and a servo sector. The decoder 9b generates servo sector pulses so that it can identify the even servo sector pulse SSP1 for an even servo sector number and an odd servo sector pulse SSP2 for the odd servo sector pulse SSP2 according to the sector number of each servo sector. A CPU 10 generates a data sector pulse for detecting the start of the data sector belonging to the even servo sector or the odd servo sector based on the timing of the even servo sector pulse SSP1 or the odd servo sector pulse SSP2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus, such as a hard disk apparatus, for accessing a disk in sector units.

[0002]

2. Description of the Related Art Conventionally, a small hard disk device (HD
In D), a sector servo system in which servo data is recorded in a circumferential direction on a disk which is a recording medium at predetermined intervals is well known. In the sector servo system, the data surface of the disk is roughly divided into a servo area for recording servo data and a data area for recording / reproducing normal user data (host data).

The HDD forms a large number of tracks in the radial direction on the data surface of the disk, divides each track into a plurality of sectors, and accesses (records / reproduces) data in sector units. Normally, a disk used for an HDD uses one of both sides or each of a plurality of both sides as data surfaces, and therefore tracks are handled by the concept that tracks in the same axial direction are called cylinders.

By the way, in the normal sector servo system,
A servo area is provided at the head of each sector, and a cylinder address code and burst data used for head positioning control are recorded in the servo area as servo data. Further, an index / sector pattern for generating an index / sector pulse which is a timing pulse for detecting each sector is recorded in the servo area. The index pulse is a pulse serving as a reference point of the cylinder and is a pulse output only at a specific sector position. The sector pulse is a pulse serving as a reference point for each sector. The HDD servo controller decodes the index / sector pattern read by the head, generates an index / sector pulse, and outputs it to the CPU. The CPU is a microprocessor for controlling the HDD, and controls the data recording / reproducing of the HDD based on the index / sector pulse.

In recent years, a CDR capable of achieving a high data recording density as compared with a normal sector servo system
(Constant density recordi
ng) type HDD has been developed. In the CDR system, the disk is divided into a plurality of zones in the radial direction, and each zone includes several tens to several hundreds of cylinders (tracks). The CDR system has a sector structure in which the physical circumference of a cylinder is assumed and the recording density for the circumference is made substantially constant, and the data transfer rate is different for each zone.

On the other hand, in the CDR system, since the servo area is radially provided on the disk over each zone, it is not necessarily arranged at the head of each sector. In other words, the servo sector based on the servo area may include one or a plurality of data sectors, for example, the immediately following data sector and a part of the data sectors continuous with it.

Such a CDR type HDD decodes an index / sector pattern read from a servo sector by a head to generate an index pulse and a servo sector pulse. Then, based on the timing of the generated servo sector pulse, a data sector pulse corresponding to the head position (ID area) of each data sector included in the servo sector is generated. The CPU controls recording / reproducing of data for each data sector according to the timing of the generated data sector pulse.

Here, the servo area (servo data) as described above is recorded on each data surface of the disk at the time of manufacturing the HDD, and is recorded at a position displaced quantitatively in order to improve manufacturing efficiency. Has been done. That is, for example, a servo area having a predetermined servo sector number on the data surface corresponding to head 0 is, for example, a position advanced by a predetermined amount in the rotation direction of the disk with respect to a servo area having the same servo sector number on the data surface corresponding to head 1. It is recorded in.

Therefore, when head switching occurs in accordance with access control, the data sector pulse detection time corresponding to the same sector number is set between the head currently designated and the head designated next. An error occurs by the amount of deviation. Conventionally, when head switching occurs, the time until the next servo sector pulse is measured, and the preparation for the new data sector pulse generation process is performed, or the generation of the index pulse A method of executing the recording / reproducing process from the beginning of the sector is adopted.

[0010]

As mentioned above, the CDR
In the conventional HDD including the system, the servo areas are recorded at positions quantitatively displaced for each data surface of the disk. Therefore, at the time of head switching, it is necessary to monitor the time until the next servo sector pulse or wait for the rotation to perform the next process after waiting for the generation of the index pulse, and to continuously generate the data sector pulse. It was difficult.

An object of the present invention is to realize continuous generation of sector pulses without requiring a waiting time such as time monitoring or rotation waiting at the time of switching heads, and consequently speed up access processing. It is to provide a data recording / reproducing apparatus capable of performing the above.

[0012]

A first aspect of the present invention is to read by a head in a sector servo type data recording / reproducing apparatus using a recording medium in which servo data including sector generating data is recorded at a predetermined interval. Sector pulse generation means for decoding sector generation data of the generated servo data and generating an even sector pulse corresponding to an even sector number or an odd sector pulse corresponding to an odd sector number, and timing of an even sector pulse or an odd sector pulse It is an apparatus provided with a recording / reproducing control means for performing recording / reproducing control of data in sector units based on.

A second aspect of the present invention is, in a CDR type data recording / reproducing apparatus, generation data for generating an index pulse and a sector pulse and even / odd determination data for determining an even number or an odd number in a servo area. Is provided with a recording medium. The sector pulse generation means decodes the generation data, generates an index pulse and a servo sector pulse, and generates an even servo sector pulse corresponding to an even servo sector number or an odd servo sector pulse corresponding to an odd servo sector number as a servo sector pulse. . The recording / reproducing control means generates a data sector pulse for detecting the head portion of the data sector belonging to the even servo sector or the odd servo sector, based on the timing of the even servo sector pulse or the odd servo sector pulse.

[0014]

In the first aspect of the present invention, the sector pulse generating means is
The sector generation data of the servo data read by the head is decoded, and a sector pulse for detecting each sector formed on the disk is generated. The sector pulse generating means generates an even sector pulse for an even sector number and an odd sector pulse for an odd sector number according to the sector number of each sector. The recording / reproducing control means executes recording / reproducing control for the sector of the even sector number or the odd sector number according to the timing of the even sector pulse or the odd sector pulse output from the sector pulse generating means.

In the second aspect of the present invention, the sector pulse generation means decodes sector generation data of the servo data read by the head, and generates an index pulse and a servo sector pulse for detecting a servo sector. The sector pulse generation unit generates an even servo sector pulse for even servo sector numbers and an odd servo sector pulse for odd servo sector numbers according to the sector number of each servo sector. The recording / reproducing control means generates a data sector pulse for detecting the head portion of the data sector belonging to the even servo sector or the odd servo sector, based on the timing of the even servo sector pulse or the odd servo sector pulse.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a hard disk drive (HD
FIG. 2 is a block diagram showing the configuration of the servo controller and its peripheral circuits according to the embodiment, FIG. 3 is a conceptual diagram showing the format of the disk according to the embodiment, and FIG. 5 is a conceptual diagram showing sector generation data according to the embodiment, FIG. 5 is a timing chart of sector pulses according to the embodiment, FIGS. 6 and 7 are flowcharts for explaining the operation of the embodiment, and FIG. 8 is the same. It is a conceptual diagram for demonstrating operation | movement of an Example.

The HDD is a disk rotating mechanism for rotationally driving a disk 1 as a recording medium, a servo mechanism for positioning a head H on a target cylinder on the disk 1, and a read / write for recording / reproducing data. It has a circuit system 3.

The disk rotating mechanism has a spindle motor 4 for rotating the disk 1 and a motor driver 5, and is controlled by the CPU 10. CPU10 is HD
It is a microprocessor for controlling D.

The servo mechanism has a carriage mechanism 6 for holding the head H, a voice coil motor (VCM) 7 for driving the carriage mechanism 6, and a VCM driver 8 for driving the VCM 7. The carriage mechanism 6 is
It has a head arm for transmitting the rotational movement of the VCM 7 and a suspension that supports the head H, and moves the head H in the radial direction of the disk 1 under the control of the CPU 10.

Here, the head H is composed of a plurality of heads (here, head 0 to head 4) provided for each data surface (both sides of each disk) of the plurality of disks 1. Each head H is switched according to access control to read / write data from / to a designated sector (data sector) on the corresponding data surface.

The read / write circuit system 3 has a head amplifier 13a for amplifying a read signal from the head H, a low pass filter (LPF) 13b for noise removal, and a read pulse generation circuit 13c. The read pulse generation circuit 13c is a circuit that converts the read signal output from the LPF 13b into a read pulse. Here, only the read circuit system is shown, and the write circuit system is omitted.

The read circuit system is provided with a read data reproducing circuit (see FIG. 2) for extracting user data from the read pulse output from the read pulse generating circuit 13c and transferring it to an HDC (hard disk controller) not shown. There is. HDC is a host computer and HD
It is an interface with D and performs read / write data transfer and address control.

The servo controller 9 is a component of the servo mechanism and reproduces the servo data required for the positioning control of the head H. The servo controller 9 extracts the cylinder address code included in the servo data from the read pulse output from the read pulse generation circuit 13c and outputs it to the CPU 10. The CPU 10 executes speed control for moving the head H to the target cylinder based on the cylinder address code. Further, the servo controller 9 extracts burst data (position information) from the read signal output from the LPF 13b and outputs it to the CPU 10. The CPU 10 executes the position control for positioning the head H at the center of the target cylinder based on the burst data.

Further, the servo controller 9 decodes the read pulse output from the read pulse generating circuit 13c, and the index pulse IP, the even servo sector pulse SSP1 and the odd servo sector pulse SSP2.
To generate. The index pulse IP is a pulse serving as a reference point for each cylinder of the disk 1, and one pulse is generated for one rotation.

This embodiment is premised on a CDR type HDD, and the format of the disk 1 is, as shown in FIG. 3, a servo area (SA0) arranged at a predetermined interval.
To SA7) and data sectors (DS0, DS1, DS2) having different numbers of sectors for each zone. The servo controller 9 decodes the read pulse output from the index / sector pattern (I / S pattern) recorded in the servo area, and outputs the even servo sector (SA0, SA).
When 2) is detected, even servo sector pulse SSP
1 is generated, and when an odd servo sector (SA1, SA3) is detected, an odd servo sector pulse SSP2 is generated. As shown in FIG. 3, the servo area has an AGC area other than the I / S pattern and the cylinder address code.

As shown in FIG. 2, the servo controller 9 includes a cylinder address decoder 9a and a sector pulse decoder 9b, and the cylinder address decoder 9a.
Outputs the cylinder address code CA. Further, the servo controller 9 includes a sample hold circuit 11 and A
Burst data is input through the / D conversion circuit 12, position information PD is created and output to the CPU 10. The sample hold circuit 11 holds the peak of the read signal corresponding to the burst data. The A / D conversion circuit 12
The peak value held by the sample hold circuit 11 is converted into digital burst data.

The sector pulse decoder 9b decodes the read pulse RP corresponding to the I / S pattern and generates an index pulse IP, an even servo sector pulse SSP1 and an odd servo sector pulse SSP2. I / S
As shown in FIG. 4, the patterns are roughly classified into sector patterns and index patterns. In the servo area serving as the reference point of each cylinder, an index pattern as shown in FIG. 7C is recorded as an I / S pattern.

As shown in FIGS. 9A and 9B, the sector pattern is paired with a determination bit pattern for identifying even or odd sector numbers. That is, a sector pattern having an even determination bit pattern is recorded in advance in the servo areas (SA0, SA2) of even servo sectors. On the other hand, in the servo areas (SA1, SA3) of the odd-numbered servo sector, a sector pattern having an odd-number determination bit pattern is recorded in advance.

Next, the operation of the embodiment will be described. First,
In a CDR type HDD, as shown in FIG. 3, each data surface of the disk 1 is radially divided into a plurality of zones (here, four zones of Z0 to Z3), and each zone has several tens to several tens. It consists of a format containing 100 cylinders (tracks). Each zone has the same number of servo sectors based on the servo area, but the number of data sectors for recording / reproducing user data is different. That is, the number of sectors in the outermost zone Z0 is maximum, and the number of sectors in the innermost zone Z3 is minimum.

As shown in FIG. 5, the servo sector includes one or a plurality of data sectors, for example, there is also a configuration in which it includes the immediately following data sector and a part of the data sectors continuous with it. The CPU 10 uses the data sector pulse D for detecting the head portion (ID portion) of the data sector as a timing pulse for accessing each data sector.
SP needs to be generated. The CPU 10 generates the data sector pulse DSP from the timing of the servo sector pulse SSP supplied from the servo controller 9, based on the data sector format for each zone.

By the way, on each data surface of the disk 1,
The servo area is recorded when the HDD is manufactured. At this time, in order to improve the manufacturing efficiency, the servo areas of each data surface are recorded at positions quantitatively displaced. That is, for example, a servo area having a predetermined servo sector number on the data surface corresponding to head 0 is
For example, it is recorded at a position advanced by a predetermined amount in the rotation direction of the disc.

On the premise of such basic conditions, when the head switching of the head H corresponding to each data surface occurs, the operation of generating the servo sector pulse of the present invention will be described with reference to FIG.
It will be described with reference to FIGS.

First, as shown in FIG. 8, a plurality of heads 0 to 2 corresponding to each data surface are I / O from the servo area SA.
By reading the S pattern, the servo controller 9
Generates a servo sector pulse (SSP1 or SSP2).

Now, temporarily, as shown in step S1 of FIG. 6, the head 0 is selected and the servo data is read from the servo area SA of the corresponding data surface. As shown in FIG. 2, the servo controller 9 uses the sector pulse decoder 9
The read pulse RP is decoded by b, and the index pulse IP or the servo sector pulse (SSP1 or SSP2) is generated (step S2).

When the servo area detected by the head 0 is, for example, an even servo sector of sector number 20, the sector pulse decoder 9b reads the read pulse corresponding to the even determination bit pattern as shown in FIG. 4A. To decode. Therefore, the sector pulse decoder 9
b outputs the even servo sector pulse SSP1 corresponding to the even servo sector to the CPU 10. CPU10 is
Based on the timing of the even-numbered servo sector pulse SSP1, as shown in FIG. 5, the head portion (ID
A data sector pulse DSP is generated according to the (part) (step S3).

Here, as shown in FIG. 8, the position C immediately after the head 0 reads the servo area SA of sector number 0.
At H1, it is assumed that the sector number of the head 2 is switched to 1 by address control (YES in step S4).

As described above, since the data is recorded at a position deviated from the servo area of each data surface, the head 2 reads the servo data from the servo area SA0 of sector number 0 (step S5). As a result, the sector pulse decoder 9b outputs the even servo sector pulse SSP1 corresponding to the even servo sector to the CPU 10 (step S).
6). Since the servo sector to be accessed is an odd sector number 1, the CPU 10 ignores the input even servo sector pulse SSP1 as an irrelevant servo sector pulse (YES in step S7, S8).

The head 2 continuously reads servo data from the servo area SA1 of the next sector number 1 (step S5). As a result, the sector pulse decoder 9b
Odd servo sector pulse S corresponding to odd servo sector
SP2 is output to the CPU 10 (step S6). CP
In U10, since the servo sector to be accessed is the odd sector number 21, the odd servo sector pulse SSP2
Is validated (NO in step S7). Therefore, the CPU 10 generates the data sector pulse DSP corresponding to the servo sector of sector number 1 based on the timing of the odd servo sector pulse SSP2 (step S9).

Next, as shown in step S10 of FIG. 7, the head 2 is selected and the servo data is read from the servo area SA of the corresponding data surface. The sector pulse decoder 9b outputs an even servo sector pulse SSP1 to the CPU 10 when the servo area detected by the head 2 is, for example, an even servo sector of sector number 20, (step S11). The CPU 10 generates the data sector pulse DSP based on the timing of the even servo sector pulse SSP1 (step S12).

Here, as shown in FIG. 8, at the position CH2 immediately after the head 2 reads the servo area SA0 having the sector number 0, the sector number 2 of the head 0 is controlled by the address control.
It is assumed that it has been switched to 1 (YE in step S13
S).

The head 0 is the servo area S of sector number 1.
The servo data is read from A1 (step S14). As a result, the sector pulse decoder 9b outputs the CP of the odd servo sector pulse SSP2 corresponding to the odd servo sector.
It is output to U10 (step S15).

At this time, depending on the head switching position,
Odd servo sector pulse SSP corresponding to sector number 1
Even if 2 occurs, the servo sector of sector number 1 may pass and the CPU 10 may not be ready for processing. Therefore, the CPU 10 ignores the odd-numbered servo sector pulse SSP2 input immediately after the head switching in order to reliably execute the processing (YES in step S16, S
17).

Then, the CPU 10 sends the next sector number 2
The process shifts to preparation for processing based on the even servo sector pulse SSP1. If the servo sector of sector number 2 is the access target, the data sector pulse DSP for detecting the data sector corresponding to the servo sector is generated (step S18).

As described above, according to the present invention, when the index pulse and the servo sector pulse are generated from the servo data, the even / odd determination for identifying the even number and the odd number of the sector number in the I / S pattern is performed in advance. A bit pattern is recorded, and an even servo sector pulse SSP1 or an odd servo sector pulse SSP2 is generated based on this even / odd determination bit.

The CPU 10 inputs the even servo sector pulse SSP1 or the odd servo sector pulse SSP.
Based on 2, it is determined whether or not the servo sector pulse generated at the time of head switching is valid, and if the pulse is invalid, it can be ignored.

In particular, when the servo area SA is recorded at a position deviated for each data surface as in the above-described specific example, it can be determined whether or not the servo sector pulse generated when the head is switched is effective. Therefore, it is not necessary to newly prepare for the next data sector pulse generation process or wait for the generation of the index pulse as in the conventional case, and the effective data sector pulse is continuously generated. It becomes possible.

Although the present invention is particularly effective when applied to a CDR type HDD, it can also be applied to an HDD of a type other than the CDR type. Further, it is possible to apply to a data recording / reproducing apparatus using a disk and sector system other than the HDD.

[0048]

As described above in detail, according to the present invention, even / odd sector pulses for identifying even / odd sector numbers are generated, so that a time monitoring or a waiting such as a rotation waiting is performed at the time of head switching. Continuous generation of sector pulses can be realized without requiring time. Therefore, it is possible to speed up the data recording / reproducing control based on the timing of the sector pulse, and as a result, it is possible to speed up the access processing.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing the configuration of a servo controller according to the embodiment.

FIG. 3 is a conceptual diagram showing a disc format according to the embodiment.

FIG. 4 is a conceptual diagram showing an index / sector pattern according to the embodiment.

FIG. 5 is a timing chart of sector pulses according to the embodiment.

FIG. 6 is a flowchart for explaining the operation of the embodiment.

FIG. 7 is a flowchart for explaining the operation of the embodiment.

FIG. 8 is a timing chart for explaining the operation of the data sector pulse generation circuit according to the embodiment.

[Explanation of symbols]

1 ... Disk, H ... Head, 3 ... Read / write circuit system, 9 ... Servo controller, 9a ... Cylinder address decoder, 9b ... Sector pulse decoder, 13c ... Read pulse generation circuit.

Claims (7)

[Claims] 1. A recording medium in which servo data for positioning control of a head at a specified position, the servo data including sector generation data for generating sector pulses, is recorded at a predetermined interval. Sector pulse generation means for decoding the sector generation data of the servo data read from the recording medium by the head and generating an even sector pulse corresponding to an even sector number or an odd sector pulse corresponding to an odd sector number. Recording / reproducing control means for controlling recording / reproducing of sector data to / from the recording medium based on the timing of the even sector pulse or the odd sector pulse generated by the sector pulse generating means. Data recording / reproducing device. 2. Servo data for controlling the positioning of the head at a specified position is recorded at predetermined intervals, and each servo data includes generation data for generating an index pulse and a sector pulse. A recording medium containing even / odd judgment data for judging even or odd numbers, and decoding the generation data of the servo data read from the recording medium by the head. Means for generating the index pulse and the sector pulse, wherein the sector pulse is an even sector pulse corresponding to an even sector number or an odd sector pulse corresponding to an odd sector number based on the even / odd determination data Sector pulse generating means and the even-numbered sector generated by the sector pulse generating means. Data recording and reproducing apparatus characterized by comprising a recording control means for recording reproduction control data of the sector unit with respect to the recording medium based on the timing of Taparusu or the odd sector pulse. 3. A servo sector arranged at a predetermined interval with reference to a servo area in which servo data for positioning control of a head at a specified position is recorded, and a data sector arranged at a predetermined interval for each zone, A recording medium in which generation data for generating an index pulse and a sector pulse and even / odd determination data for determining an even or odd number are recorded in the servo area, and the head reads out from the servo area. Means for decoding the generation data to generate the index pulse and the servo sector pulse, wherein the even sector corresponding to an even servo sector number in the servo sector pulse based on the even / odd determination data Odd servo section corresponding to pulse or odd servo sector number Sector pulse generating means for generating a pulse, and the head of the data sector belonging to the even servo sector or the odd servo sector based on the timing of the even servo sector pulse or the odd servo sector pulse generated by the sector pulse generating means A data recording / reproducing apparatus, comprising: a recording / reproducing control means for generating a data sector pulse for detecting a section. 4. Servo data for positioning control of the head at a specified position is recorded at predetermined intervals, and each servo data includes generation data for generating an index pulse and a sector pulse. In the data recording / reproducing apparatus provided with a recording medium in which the generation data includes even / odd determination data for determining even or odd, the head for generating the servo data from the recording medium Reading data, decoding the generation data read by the head to generate the index pulse, and an even sector pulse or an odd sector corresponding to an even sector number based on the even / odd determination data Generating an odd sector pulse corresponding to the number. To generate method. 5. A servo sector arranged at a predetermined interval with reference to a servo area for recording servo data for positioning the head at a designated position, and a data sector arranged at a predetermined interval for each zone, In the data recording / reproducing apparatus, the servo area includes a recording medium in which generation data for generating an index pulse and a sector pulse and even / odd determination data for determining an even or odd number are recorded. Reading the generation data and the even / odd judgment data from the recording medium by: decoding the generation data read by the head to identify the index pulse and the servo sector pulse; / Decode the odd number judgment data to find an even number in the servo sector pulse. Generating an even servo sector pulse corresponding to a vosector number or an odd servo sector pulse corresponding to an odd servo sector number, and the even servo sector or Generating a data sector pulse for detecting a head portion of the data sector belonging to the odd servo sector. 6. A head having a plurality of heads and a data surface corresponding to each head, and servo data for positioning and controlling the head at a designated position is recorded at a predetermined interval on each data surface. A recording medium in which each servo data includes generation data for generating an index pulse and a sector pulse, and the generation data includes even / odd determination data for determining even or odd Means for decoding the generation data of the servo data read from the recording medium by the head to generate the index pulse and the sector pulse, wherein the sector is based on the even / odd determination data. Generates an even sector pulse corresponding to an even sector number or an odd sector pulse corresponding to an odd sector number. Pulse switching means, and when the heads are switched at the time of recording / reproducing data to / from the recording medium, before switching based on the timing of the even sector pulse or the odd sector pulse generated by the sector pulse generating means. And a recording / reproducing control means for determining the sector number in which the head is located after switching from the sector number in which the head is located. 7. A head having a plurality of heads and a data surface corresponding to each head, and servo data for controlling the positioning of the head at a designated position is recorded on each data surface at a position shifted for each data surface. Has been done,
Each servo data includes generation data for generating an index pulse and a sector pulse, and the generation data includes an even number / number for determining an even number or an odd number.
A recording medium including odd number determination data, and a unit for decoding the generation data of the servo data read from the recording medium by the head to generate the index pulse and the sector pulse, Sector pulse generation means for generating an even sector pulse corresponding to an even sector number or an odd sector pulse corresponding to an odd sector number among the sector pulses based on even / odd determination data, and recording / reproducing data to / from the recording medium. At the time of switching between the heads, the sector number after the switching from the sector number in which the head before switching is located based on the timing of the even sector pulse or the odd sector pulse generated by the sector pulse generating means. Recording / playback control hand that determines the sector number where the head is located Data recording and reproducing apparatus characterized by comprising and.