Hard disk DOS management structure

1. Track, sector, cylindrical and head count

The most basic part of the hard disk by acer laptop keyboard hard metal material made of coated with magnetic medium results, different capacity hard disc number inequality. There are two sides to every blanks, can

Record information. Disc is divided into many quadrant area, each region that a sector, each sector can store 128 x 2 N power (N = 0.1.2.3) bytes information. In the DOS

In each sector is 128 x 2 2 power = 512 bytes, disc surface in disc center to central, radius of different series of concentric circles called tracks. Hard disk, different blanks the same radius

The track of cylindrical called cylinder. Track and cylinder is said different radius circle, on many occasions, and track and cylindrical used interchangeably, we know that each magnetic

Disc has two sides, each plane has a head, used to head number to distinguish. Sector, track (or cylindrical) and head number constitute the basic parameters of the acer aspire 5740 laptop keyboard structure of hard disk, help these

Parameter can get hard drive capacity, base calculation formula is:

Storage capacity = head count × track (cylindrical) number × × each sectors every sector bytes

Key points: (1) hard disk several blanks, each disc two sides, each face a head

(2) the disc is divided into multiple quadrant area namely sector

(3) the same disc different radius of concentric circles for track

(4) different blanks the same radius of the composition of the combinatory cylindrical surface namely

(5) formula: storage capacity = head count × track (cylindrical) number × × each sectors every sector bytes

(6) information record and acer aspire 5740dg laptop keyboard can be expressed as: xx track (cylindrical), x head, x sector

2. Cluster

"Cluster" is allocated DOS the minimum unit. When creating a small file, so a byte, then it on disk is not only about a byte space,

But occupies the whole one cluster. DOS depending on the different storage medium (such as a floppy disk, hard disk), different capacity of the hard drive, the size of a cluster is different also. The size of a cluster can be in called disk

Parameter block (BPB) acquisition. The concept of cluster only apply to data area.

This point: (1) "cluster" is allocated DOS the minimum unit.

(2) different storage medium, different acer aspire 5740g laptop keyboard capacity of the hard disk, different DOS version, the size of a cluster is different also.



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Five unknown ESC key magical effect

For the average user acer aspire 5742g laptop keyboard is concerned, is located in the upper left the ESC key on the keyboard is not commonly used, but you know what? In fact with the ESC key also can realize many shortcuts oh!

1. On the Internet, if some wrong a web site, direct press the ESC key to stop the current web page can be open.

2. The Internet always avoid to fill in some user name what of, if fill wrong, press the ESC key can clear all the box inside content; And typing, if wrong can acer aspire 5742z laptop keyboard also press the ESC key to clear the wrong selected word box.

3. In addition to "Ctrl + Alt + Del" key combination can tune out Windows task manager outside, press "Ctrl + Shift + Esc key combination can start task manager.

4. When a program is not in active state and we also want to restore its for active state, press "Alt + Esc key can activate the application, and don't have to use the mouse to click the program title bar.

5. For existence "cancel" option in the popup window,acer aspire 5742zg laptop keyboard if you want to choose cancel of words, direct press the ESC key can be realized "cancel" operation.

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