KR100417228B1 - Recording medium of hard disk drive having three burst signals - Google Patents

Abstract

PURPOSE: A recording medium of HDD(Hard Disk Drive) having three burst signals is provided to sequentially record the first burst signal for supplying current position information on a head and the second/third burst signals for supplying position information related to on-track control, in a track search mode, thereby increasing a data storage capacity. CONSTITUTION: The first burst signal(A) and the second burst signal(B) are alternatively recorded at each track boundary in order to supply current position information on a head(16) in a track search mode. The third burst signal(C) is alternatively recorded with the second burst signal(B) in each track center line so as to provide position information with regards to on-track control of the head(16) in a track following mode. The first/second burst signals(A,B) and the third burst signal(C) are sequentially recorded in a servo burst section. A section of the second burst signal(B) is 1.5 times more than that of the first and third burst signals(A,C) to be alternatively recorded in the first and third burst signals(A,C).

Description

Hard disk drive recording media with three burst signals.

The present invention relates to an example of a servo burst signal for servo control of a hard disk drive, and more particularly, to a hard disk drive recording medium having a burst section in which three burst signals are recorded.

A hard disk drive is a device that records / reads data in a magnetic form on a rotating magnetic disk and is widely used as a secondary memory device of a computer system because a large amount of data can be accessed at high speed. Such a hard disk drive uses a magnetic disk (hereinafter referred to as a disk) having a plurality of tracks arranged concentrically as a recording medium, and the tracks are accessed by a head for recording / reading data on the disk. The head is selectively positioned on any one of the plurality of tracks under the control of the servo controller. In this way, to selectively position the head on a particular track, the servo controller must know the current head position for each track. Servo information informing the position of the head relative to the tracks as described above is provided by using a particular servo pattern which is read on the disc by the head. Hereinafter, the above-mentioned servo information will be described with reference to FIG. 1, which shows the format of a predetermined track on a disc in which data sectors and servo sectors are alternately arranged.

FIG. 1 shows a format diagram for a given track on a disk used as a recording medium of a hard disk drive. In FIG. 1, (A) shows an arbitrary track format among a plurality of tracks arranged in the center of a disk on a disc, in which a servo sector and a data sector are alternately arranged. The data sector usually consists of an ID section in which ID information is recorded and a data section in which actual data is recorded. As shown in (B), the servo sector includes a preamble section for synchronizing with the system clock, a servo address mark (SAM) section in which reference patterns for generating various servo timings are recorded, Index (lndex: IDX) section for providing disk rotation information, Gray Code section for recording track information, and Servo Burst (A, B) for on-track control of the head. , C, B) section. At this time, the recording patterns of the burst signals A, B, C, and D recorded in the servo burst section are as follows. First, burst signals A and B are used in track search in combination with track information recorded in the gray code section. That is, as shown in FIG. 1C, the burst signal A is recorded on the odd tracks (N-1, N + 1 tracks), and the burst signal B is recorded on the even tracks (N tracks). Provide information. On the other hand, the burst signals C and D are recorded as half values between adjacent tracks centering on the track center line (hereinafter referred to as TCL), so that the position error signal of the head in the track tracking mode (Position Errir Slgnal: PES) ). That is, in the track following mode, when the head is accurately positioned at the TCL, the detection level difference of the burst signal read out from the burst section in which the burst signals C and D are recorded is "0". Therefore, the servo control unit can know the deviation state and the deviation amount of the head by the difference between the detection levels of the burst signals C and D, and can control the on-track of the corresponding head. However, in the case of a hard disk drive having a burst section in which four burst signals as described above are recorded, it is possible to shorten the time for placing the hye on the target track during data read / write operation. There was a problem in that the data section in which data was recorded could not be extended because it had to be recorded.

Accordingly, an object of the present invention is to provide a hard disk drive recording medium in which only three burst signals are recorded to implement a high capacity hard disk drive.

In order to achieve the above object, the present invention provides a hard disk drive recording medium having a servo burst section in which a burst signal for position control of a hye is recorded.

A first burst signal for providing current position information of the head in a track search mode;

In the track following mode, second and third burst signals for providing position information for on-track control of the head are sequentially recorded in the servo burst section.

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

2 is a schematic block diagram of a general hard disk drive. Referring to FIG. 2, the microprocessor 10 may include a programmable read only memory (PROM) 12 that stores a predetermined control program, a servo control algorithm, and the like of the microprocessor 10. . It is connected to a static random access memory (hereinafter referred to as SRAM) 14. The head 16 performs horizontal movement on the disk 18, which is a recording medium, and records and reads data on the disk 18. A voice coil motor (VCM) 20 is connected to the head 16 as an actuator and drives the head 16 horizontally on the disk 18. The spindle motor 22 rotates by connecting the disk 18 to the drive side as a rotary motion actuator. The VCM driver 24 is connected to the VCM 20 and controls the driving of the VCM 20. The digital / analog converter (DAC) 26 is connected to the microprocessor 10 and the VCM driver 24 to receive a digital control input signal U from the microprocessor 10 and convert the analog signal into an analog signal. Output to the VCM driver 24. The motor driver 28 is connected to the spindle motor 22 and the microprocessor 10 and controls the driving of the spindle motor 22 under the control of the microprocessor 10. The amplifier 30 is connected to the head 16 to amplify and output the read signal and to amplify and output the data signal to be recorded to the head 16. The interface controller 38 is controlled by the microprocessor 10 to transmit and receive data with an external data input device (not shown). A read / write channel circuit 32 is connected to the microprocessor 10, the amplifier 30, and the interface controller 38, and is under the control of the microprocessor 10. The recording data is received from the encoder, and is encoded into an analog flux change signal and output to the amplifier 30. In addition, the read / write channel circuit 32 digitally converts the analog reading signal input from the amplifier 30 and outputs the encoded read data (hereinafter referred to as an ERD signal). An analog / digital converter (ABC) 34 is connected to the read / write channel circuit 32 to receive an analog servo reading signal, and digitally converts the input signal to PES to output to the microprocessor 10. A gate array 36 is connected to the read / write channel circuit 32 to receive the ERD signal, and detects each servo information such as a gray code in the servo region of the disk 18 from the ERD signal. Output

3 is a diagram illustrating a recording form of a burst signal according to an embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. First, three burst signals are recorded in advance as part of the servo information for one track, the A burst signal and the B burst signal are recorded alternately around each track boundary, and the C burst signal is one. Starting from the track center line of the track, the track line of the next track is recorded. The three burst signals A, B, and C are detected by the head 12, sampled through the encoder 22, and input to the microcontroller 28 through the ADC 26. In the search mode, the current position of the head is determined by using the above-described digital conversion of PESI or PES2 to 8 bits, that is, 256 equal values and gray codes. In the track following mode, only the PES2 signal is used to determine the head position. Determine your location. In addition, the good / excellent track information Digodd indicates a value of 0 when the current track on which the current head 12 is located is an even track, and a value of 1 when the current track is an odd track. And PES sum (Digpha) represents the sum of PES2 and PESl. PES difference (Digphb) represents the difference of PESI from the PES2. As described above, the search information Skfig represents a 3-bit data value composed of a combination of the above-described good / excellent track information Digodd and the PES sum Digpha and the PES difference Digphb. First, when the center of the track is set to "PES = 0" by dividing the total PES value for one track by 256 equally, the PES value at the boundary between the N track and the N-1 track is -128, The PES value at the boundary between the N track and the N + 1 track described above is +127, so the PES resolution is 256 resolution, for example. In general, only the PES2 value should be used to calculate the head off-track amount based on the center of the track. However, in terms of track and track economics, the precision is not read in consideration of the head gap width (for example, 80%). In the mode, the dead zone of the PES2 determines the position of the head using the PESI value instead of the PES2 value.

The present invention as described above has the advantage of increasing the data storage capacity in recording data on the disk by controlling the position of the head using a disk recording medium having three bursts.

FIG. 1 is a format diagram of a predetermined track on a magnetic disk used as a recording medium of a hard disk drive.

2 is a schematic block diagram of a general hard disk drive.

3 is a recording form of a burst signal according to an embodiment of the present invention.

Claims (1)

In a recording medium of a hard disk drive having a servo burst section in which a burst signal for position control of a head is recorded, First and second burst signals recorded alternately on the basis of each track boundary in order to provide current position information of the head in a track search board; In order to provide position information for on-track control of the head in the track following mode, a third burst signal recorded alternately with the second burst signal on the basis of each track center line is sequentially arranged in the servo burst section. Are recorded, And the interval of the second burst signal is 1.5 times that of the interval of the first and third burst signals so that the second burst signal is simultaneously recorded in the first and third burst signals.