KR19990056098A - Index pulse generation method - Google Patents

Abstract

end. FIELD OF THE INVENTION The present invention relates to a method of generating an index pulse of a disc drive recording apparatus.

I. The technical problem to be solved by the present invention: In a hard disk drive using a disk in which the servo information, in which the index information is deleted, is recorded in all servo sectors, as a recording medium, an index pulse indicating the start position of each track can be generated. In providing a method.

All. Summary of the Invention Solution: Since the index pulse can be generated only by reading the sector number written in the first servo sector of each track even if the index information is deleted from the servo information, desired data can be written or read on the target sector. have.

la. Important use of the invention: It can be used for hard disk drive.

Description

Index pulse generation method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of generating an index pulse in a disk drive recording apparatus, and more particularly to a method of generating an index pulse without recording index information on a disk surface.

Disc drive recording devices are widely used as auxiliary storage devices of computer systems today. A representative example of the disk drive recording apparatus is a hard disk drive. The hard disk drive writes data to, or reads data from, a predetermined track on the disk surface in response to a data read / write command received by the host computer. In this case, some servo information is required to move the head to the target track and to continuously follow the target track. The servo information is recorded on the disk by the servo writer in the writing process of each other during the manufacturing process of the hard disk drive.

Referring to the configuration of the servo information recorded on the disc surface by the servo writer, first, FIG. 1 shows a sector format diagram of an arbitrary track among tracks arranged concentrically on the disc surface. That is, in FIG. 1, (a) shows the sector format of an arbitrary track, and (b) shows the format of a servo sector. All tracks arranged concentrically on the disk surface are composed of a data sector and a servo sector as shown in Fig. 1A. As shown in (b), the servo sector includes a preamble section, a servo address mark (SAM) section, a gray code section, a servo burst section, and a postamble section. In the gray code section, the sector number, head number, and cylinder number used in the track search are recorded in gray code. The burst signals A, B, C, and D are recorded in the servo burst section and used for on-track control of the head. One-bit index information is recorded in the index IDX section. The index IDX is divided into a main index and a sub index in each track. The function of the index is to provide the disc 1 rotation information, that is, the start position of each track. The division between the main index and the sub index is performed by reading the 1-bit index information recorded by the servo writer (having different patterns) through the head during the manufacturing process, and then the read signal indicates the main index or sub index. Determine by firmware. For example, if the index bit is "1", the main index is selected. If the index bit is "0", the sub-index is determined. In the case of the main index, an index pulse is generated to provide position information on the starting point of the corresponding track. However, the main index is required to provide the position information on the starting point of each track, but the remaining sub indexes exist for recording the main index, resulting in waste of unnecessary servo sectors.

Accordingly, an object of the present invention is to provide a method for generating an index pulse indicating the start position of each track in a hard disk drive using a disk having servo information from which index information is deleted in all servo sectors as a recording medium. In providing.

To achieve the above object, the present invention provides a disc for recording servo information from which index information is deleted in a plurality of servo sectors in each of a plurality of tracks arranged in a concentric circle, and reading data from the disc. An index pulse generation method of a disc drive recording apparatus for writing data onto the disc surface,

In response to receiving a data read / write command, searching the head with a target track in response to receiving a data read / write command, checking whether the desired sector number is input while tracking the head after completing the track search, and checking the desired result. When the sector number is input, it is characterized in that the process of generating and outputting an index pulse that is the start position information of the target track.

1 is a sector format diagram of any track among tracks arranged concentrically on the disk surface;

2 is a block diagram of a hard disk drive according to an embodiment of the present invention.

3 is an index pulse generation control flow chart according to an embodiment of the present invention.

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

2 is a block diagram of a hard disk drive according to an embodiment of the present invention. Referring to FIG. 2, two disks 10 mounted on the spindle motor drive shaft rotate by a spindle motor driven by the spindle motor driver 30. The heads 12 are installed on the support arms extended from the E block assembly 13 and exist in the same number as the number of recording surfaces of the disc 10. The heads 12 are moved radially on the disc recording surface by the VCM (not shown) driven by the Voice Coil Motor (VCM) driving unit 28 and read data in the target sector of the target track. The preamplifier 14 preamplifies the signal picked up by the selected head 12 and outputs the preamplified signal to the read / write channel circuit 16, and at the time of data write, the read / write channel. The write current according to the coded write data input from the circuit 16 is applied to the selected head 12 so that the predetermined data is written to the disk surface. The read / write channel circuit 16 detects data pulses from the read signal input from the preamplifier 14, decodes the data pulses, outputs them to the DDC (Disk Data Controller) 18, and writes the applied data from the DDC 18. The data is encoded and output to the preamplifier 14. On the other hand, the DDC 18 includes a disk sequencer that performs an operation according to a micro program downloaded from the microcontroller 24 and transmits data transmitted from the host computer through the read / write channel circuit 16 and the preamplifier 14. The data is written to the disk surface and the data read from the disk 10 is transferred to the host computer. That is, the DDC 18 activates the read gate (RG) signal or the write gate (WG) in response to the data sector pulse input from the disk signal controller 22 to activate the read / write channel circuit 16. ) The DDC 18 interfaces the communication between the host computer and the microcontroller 24 and temporarily stores the data transmitted between the disk 10 and the host computer in the buffer RAM 20. The microcontroller 24 controls each part of the drive in response to the data read / write command received from the host computer to allow predetermined data to be written or read from or to the disk 10 surface. The ROM 26 stores a control program and various initial variable values and an estimation algorithm for servo control (speed control and position control) of the head according to an embodiment of the present invention. Meanwhile, the spindle motor driver 30 generates a current corresponding to the control output value input from the microcontroller 24 to control the rotation of the spindle motor. The VCM driver 28 also generates a current corresponding to the control output value input from the microcontroller 24 to control the rotation direction and speed of the VCM. The disk signal controller 22 generates and outputs signals necessary for data read / write based on various servo information input from a servo demodulator (not shown) in the read / write channel circuit 16. For example, the position error signal output from the servo demodulator is A / D converted and output to the microcontroller 24, while the start position of each track according to the servo information output from the servo demodulator. An index pulse indicating and a data sector pulse indicating the start of the data sector are generated and output to the DDC 18. Since the disk signal controller 22 is one-chip IC with the microcontroller 24 in recent years, the following description assumes that the microcontroller 24 and the disk signal controller 22 are one-chip IC. It is named generically as (24).

3 illustrates an index pulse generation control flow chart according to an embodiment of the present invention. Hereinafter, an index pulse generation process according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3.

First, in the disk according to the embodiment of the present invention, as shown in FIG. 1A, tracks composed of data sectors and servo sectors are arranged concentrically. The servo sector has a format in which index information is deleted from the format shown in FIG. That is, the servo sector according to the embodiment of the present invention includes a preamble section, a servo address mark (SAM) section, a gray code section, a servo burst section, and a postamble section. Such servo information is recorded in the servo sector of the disk surface in advance by the servo writer in the servo writing process in the manufacturing process.

Hereinafter, the process of generating the index pulse using the signal read from the disk having the above-described servo sector format will be described. Referring to FIG. 3, the microcontroller 22 first determines whether a data read / write command is input from the host computer. Examine at step 40. When the test result data read / write command is input, the microcontroller 24 proceeds to step 42 to perform track search for moving the head 12 to the target track. If it is detected in step 44 that the track search is completed, the microcontroller 24 proceeds to step 46 and performs track tracking for on-tracking the head 12 on the target track. During track tracking, the microcontroller 24 searches for read data input from the disc signal controller 22 and checks in step 48 whether there is an input of sector number " 0 ". The reason is that sector number " 0 " is recorded in the gray code section of the servo sector in which the main index information is recorded in all tracks. Therefore, in the embodiment of the present invention, the index pulse can be generated only by inputting the sector number "0" even after the main index information is deleted. If there is an input of sector number "0" at step 48, the microcontroller 24 proceeds to step 50 and generates and outputs an index pulse indicating the start position of the current track. The microcontroller 24 sequentially performs steps 52 and 54, and when the target sector of the target track is searched, proceeds to step 56 to write data on the target sector or read data written in the target sector. .

As described above, in the embodiment of the present invention, even when the main index information is deleted from the servo information, the index pulse can be generated only by reading the sector number written in the first servo sector of each track, thereby writing or reading desired data on the target sector. can do.

As described above, the present invention has the advantage of maximizing data storage capacity by deleting index information from the servo information recorded in the servo sector, and at the same time, stably generating the index pulse even after deleting the index information. There is an advantage.

Claims (2)

A disc for recording servo information from which index information is deleted in a plurality of servo sectors existing in each of a plurality of tracks arranged concentrically, and a disc for reading data from or writing data to the disc surface. In the index pulse generation method of the drive recording apparatus, Searching for the head as a target track in response to receiving a data read / write command; Checking the input of the desired sector number while tracking the head after completion of the track search; And generating and outputting an index pulse which is start position information of the target track when the desired sector number is input. 2. The apparatus of claim 1, wherein the servo information recorded in the servo sector is at least; A servo address mark for providing a reference point of timing generation necessary for servo control; Graycode to provide the current track number, head number and sector number, Index pulse generation method characterized in that consisting of a burst signal for the on-track control of the head.