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Hard Disk

What is Hard Disk?

It is a secondary storage device. In other word called a permanent storage device. The geometry of a hard disk drive is the organization of data on the platters. The geometry of the hard disk drive specifies how and where to store data on the surface of each platter. 

It is usually specified by the following numerical values.

  • Heads
  • Cylinders
  • Sectors per track
  • Write precompensation
  • Landing zone 
Hard Disk Components

Components of a Hard Disk

  • Platters and Media
  • Read/Write Heads
  • Head Sliders, Arms and Actuator
  • Spindle Motor
  • Stepper Motor
  • Connectors and Jumpers
  • Logic Board
  • Integrated Cache

Platter (Tracks should be in Circle)

In a platter is made up of Aluminium it only stores data. It is a light material, it has high tolerance, and shape does not change. Under the high centrifugal force that occurs at high rotation. Nowadays platter is made up of ceramic and glass, which have low thermal material. (Rotation speeds: New = 7600-10000 RPM, Old = 3600-5200RPM) Data stored in binary.

Spindle Motor

The Spindle Motor is use to rotate the platter.

Stepper Motor

The Stepper motor function is to move the head to the platter, to read/write the data. Input/output data are send through the header.

Printed Circuit Board (PCB)

The Printed circuit board is use to convert Binary information into digital information, which stores in platter through R/W head. It is used to function the hard disk through many ICs.

Read/Write Heads

It is used to Read/Write the data. The header will be located the information data, it collects the data with the help of an electrical signal.

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