Component of a hard disk

1. Platters and media:-

A hard disk driver consists of on one or more flat circular discs called platters on witch data is stored. The platters are composed of two main substances: – A substrate material that forms the majority of the platter and gives the platter a structure and rigidity.A magnetic media coating which actually holds the magnetic impulses that represent the data.
The hard disks actually get their name from the rigidity of the platters used, as       compared to floppy disks and other media which use flexible “Platters”.
2. Read\Write Heads :-

The read\write heads of the hard disk are the interface between the magnetic physical media on which the data is stored and the electronic components that cake up the rest of the hard disk (and the PC). The read\write heads are responsible for converting bits to magnetic pulses and storing them on the platter when data is written on the hard disk. The read\write heads then again converts back the magnetic pulses stored on the hard disk into bits when data is read from the hard disk.
3. Actuator Assembly  :-

The read\write heads of a hard disk are responsible for reading data and writing data on the hard disk. To perform its task effectively the read\write head must be held in a fixed position relative to the surface it is reading and should also be allowed to move fro track to track to allow access t the entire disk surface area. The surface on which the read \write heads are mounted is called the actuator assembly. The actuator assembly looks similar to a comb with its teeth inserted between the platters.
4. Spindle Motor :-

The spindle motor, also called the spindle shaft, is responsible for moving the platters around that make the hard disk operational the spindle motor provides stable, reliable and consistent turning power to the head disk to function it properly.

5. Hard Disk Connectors and Jumpers:-

Before we go into discussing connectors and jumpers used in a hard disk, let’s first discuss what jumpers are? Jumpers are small devices that are used to directly control the operation of hardware devices, without using any software. A jumper has two main c components.   • Jumper: Jumper itself is a small piece of plastic and metal that is used to connect or    remove the hardware device from the computer.
• Jumper Pins: A set of pins, across two of which a jumper is placed to make a specific connection.

Different types of connectors and jumpers used hard disks are:
•     Power Connector
•    Data Interface Connector •   IDE\ATA Configuration Jumpers
•   SCSI Configuration Jumpers
•   JED Connector


6. Hard Disk Logic Board  :-

All modern hard disks contain an intelligent circuit board built in the hard disk unit itself. However, in early hard disks all of the control logic the hard disks operation was placed into the controller plugged into the pc. But with newer drives advance features and high performance, with the reduction in the size of electronic components, the hard disk manufacturers moved most of the control function to the drive itself. The logic board is responsible to control hard disk functions, and ad  hard disks becomes faster and more sophisticates; more function are added to the logic board  being designed with support to handle more complicated head technologies, faster interfaces and higher bandwidth data streaming from the disk itself.

7. Hard Disk Integrated Cache :-      

All modern hard disks contain a cache integrated into the hard disk unit itself. This is called hard disk integrated cache or hard disk buffer. The purpose of this cache is similar to that of other caches in the computer. This cache temporarily stores the results of recent from the disk, and also “pre-fetch” information that is likely to be requested in the bear future.





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