硬盘主要磁道柱面和扇区（Main tracks, cylinders, and sectors of a hard disk）.docVIP

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硬盘主要磁道柱面和扇区（Main tracks, cylinders, and sectors of a hard disk）.doc

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硬盘主要磁道柱面和扇区（Main tracks, cylinders, and sectors of a hard disk）

硬盘主要磁道柱面和扇区（Main tracks, cylinders, and sectors of a hard disk） Tracks, sectors, cylinders, and heads The basic component of a hard disk is a disk made of hard metal material coated with magnetic medium, varying in number of disks of different capacities. Each disk has two sides that record information. The disk is divided into many fan-shaped regions, each of which is called a sector. Each sector can store 128 * 2 N times (N = 0.1.2.3) byte information. In DOS, each sector is 128 * 2 of the 2 square = 512 bytes, the disk surface with the center of the disk as the center, concentric rings of different radii are called tracks. A cylinder consisting of tracks of the same radius and different disks in a hard disk is called a cylinder. Track and cylinder are different radius of the circle, on many occasions, track and cylinder can be used interchangeably, we know that each disk has two faces, each face has a head, head number used to distinguish. Sectors, tracks (or cylinders) and number of magnetic heads form the basic parameters of the hard disk structure, and the capacity of the hard disk can be obtained by using these parameters: Storage capacity = head number * track (cylinder) number * per sector number * per sector byte Main points: (1) the hard disk has several disks, each of which has two planes, each with a magnetic head (2) the disk is divided into several sectors, namely sector (3) concentric circles with different radii on the same disk are tracks (4) cylindrical surface with different radii, namely cylinder; (5) formula: storage capacity = magnetic head number * track (cylinder) number * per sector number * per sector byte number (6) the information records can be represented as * * tracks (cylinders), * heads, * * sectors The 2. cluster A cluster is the smallest unit in which DOS is assigned. When a small file is created, such as a byte, it does not take up only one byte of space on disk, but occupies the entire cluster. DOS depending on the storage mediu