Method and apparatus for forming data sector suitable for high density hard disk drive

#This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for METHOD AND APPARATUS FOR FORMING DATA SECTOR SUITABLE FOR HIGH DENSITY HARD DISK DRIVE earlier filed in the Korean Industrial Property Office on May 21, 1996, and there duly assigned Ser. No. 17281/1996.

#1. Technical Field

#The present invention relates to a hard disk drive, and more particularly, relates to a method and apparatus for forming a data sector suitable for a high density hard disk drive in which data sector has a data region including an ID region incorporated therein.

#A more complete appreciation of the present invention, and many of the attendant advantages thereof, will become readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein:

#FIG. 1 is a block diagram of an exemplary hard disk drive (HDD);

#FIGS. 2A to 2I illustrate a data sector format in which a servo sector and a data sector are alternately written for the exemplary HDD, and timing diagrams of read and write gate signals according to the exemplary HDD;

#Referring now to the drawings and particularly to FIG. 1, which illustrates an exemplary hard disk drive (HDD) which is commonly used as an auxiliary memory for a computer system for magnetically reading and writing data from/to a rotating magnetic disk. As shown in FIG. 1, the exemplary HDD includes a hard disk assembly (HDA) 10, a read/write channel circuit 30 and a disk data controller (DDC) 50. The read/write channel circuit 30 detects a data pulse from a signal received from a pre-amplifier (not shown) and decodes the detected data pulse to generate read data In addition, the read/write channel circuit 30 encodes write data received from the DDC 50 and provides the encoded write data to the pre-amplifier. The DDC 50 which interfaces between a host computer and the read/write channel circuit 30 receives and transfers the read and write data from/to the host computer under the control of a central processing unit (CPU) (not shown) which controls an overall operation of the HDD. As illustrated in FIG. 1, various control signals such as a write gate (WG) signal, a read gate (RG) signal, an NRZO signal, an NRZ 1 signal, and a read reference clock (RRC) signal are directly communicated between the read/write channel circuit 30 and the DDC 50 in order to control the data read/write operations. In this case, a data sector commonly includes typical identification (ID) information.

#Referring to FIGS. 2A to 2I, which illustrate a data sector format for the contemporary HDD in which a servo sector and the data sector including an ID region are alternately written, and timing diagrams according thereto. Specifically, FIG. 2B illustrates a data sector format of an arbitrary track on the magnetic disk, in which the servo sector and the data sector are alternately written. As illustrated, the data sector includes a plurality of ID regions and data regions. Further, a PAD region interposed between the ID region and the data region in the same data sector is a separation region for separating ID information from data information. The last PAD disposed within the data sector is a region for providing a margin between the adjacent data sectors. FIG. 2A illustrates detailed data formats of the ID region and the data region. Commonly, the ID region includes an ID sync, an ID address mark (AM), a head and cylinder number, a sector number, a split and flag, and a cyclic redundancy check code (CRC). The data region includes a data sync, a data address mark (AM), data, and an error correction code (ECC).

#FIGS. 2C and 2D illustrate timing diagrams of the RG and WG signals generated from the DDC 500 during a data read mode of operation. FIGS. 2E and 2F illustrate timing diagrams of the RG and WG signals during a data write mode of operation. FIGS. 2G and 2H illustrate timing diagrams of the RG and WG signals during formatting operation; and FIG. 21 illustrates a timing diagram of a sector pulse SP for notifying a beginning of the data sector.