MAGNETIC DISC

Magnetic DISC
• The capacity to continue growing, because the computer application system growing
• Database, which usually requires a large more than 1 hard disk for storage
• Phisik a disk made of material Magnetic disks are made from a number of plate / disc. The surface of each disc (top / bottom) made of materials that are easy to iron magnetisasi.


Recording data
• In the Magnetic disks on and off the code is represented by elements magnetiknya position.
• In Looking surface of the disk with magnets (which is on the head), the magnet element changed. This means that the code can be changed on-off and vice versa.
• hole-hole in the surface of the disk represents the data arranged in a point called the track. Data stored in the form of concentric tracks (full circle)
• Each track is divided into sector-sector (block).
• Magnetic disks organized into a cylinder-cylinder.
• Cylinders is the track on the same surface-surface on the disc-disc different.
• Head R / W store information taken from magnetisasi sectors that are underneath.
• Head R / W float on the surface of platter
• If Head R / W touch the plate surface, the data are underneath will be damaged
• Disc Controller is the interface between computer systems and hardware from the hard disk with the read / write on a sector.
• Disc controller is also responsible for the bad sector remapping, so the data are not stored in bad sectors on your hard disk

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