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There are very few people who have seen a hard disk. Unlike the floppy disk drive are so delicate that must be constantly in a protective aluminum.

Everything you see is a box of metal with some circuits. There is no easy way to access the box to see the disk: open the disc means the contamination.

The units were opened only in clean rooms or rooms where workers wear clothes surgeon and the air is not filtered to contain dust particles. Some discs are included in removable cartridges that are inserted into units, but most are not removable.

IBM invented the disk drive is not removable small and has called Winchester (apparently, because the number of coincided with the model number of a popular Winchester rifle).

Runs, sectors and heads of the hard disk.

Despite all this impressive armour, a hard disk is not very different from a floppy. The data are recorded in written form of magnetic flux in a circle around the ring central disk.

Each of concentric circles form a track and each track is divided into an equal number of segments called sectors. The head read / write moves from external ring disk toward the center, stopping above the track which contains the information required by the computer.

Once in the right position, the head expects that the industry is correct to below it, then law or write data in the field. C

Hard Drive, CDs, DVDs, diskettes.

Hard disks are different from other storage media for the density with which data are recorded on the surface of the disk, and the speed with which they operate.

Unlike other media, the hard disk can store up to ten times more data on each track. Because of this density of data is necessary to head a head of read / write very small and very close to the surface of the disk.

Any flexibility of hard disk would jump and beat head read / write. For this reason the disc is made of a hard surface and rigid using slabs of aluminum coated with magnetic material.

The dishes on the hard disk.

In order to improve the capacity most of the hard drive contains two or more disks. The discs, which are commonly called plates, are mounted around an axis called "spindles." All dishes rotate at the same time.

The engine's moving plates can be incorporated in the "spindles", or it may be placed below the "spindle". Both sides of the plate contain data.

Since it would be impractical for a head reading / writing work for all sides of the dishes, each side of the pot has its head. The heads are grouped in a frame-shaped comb that moves them all at

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