Magnetic disk

Magnetic Disks

Introduction

Magnetic disks are a type of non-volatile storage device that use magnetic material to store data.

Components

• Platters:
  • Round, rigid disks coated with magnetic material.
  • Data is stored on both sides of the platter.
• Read/Write Heads:
  • Floating above the platters, these heads read and write data.
  • Precise control is necessary to avoid collisions.
• Actuator:
  • Moves the read/write heads to the correct position.
  • Fast and precise movement is crucial.

How it Works

• Data Storage:
  • Data is stored in tiny magnetic fields on the platter.
  • The read/write heads detect and modify these fields.
• Data Retrieval:
  • The read/write heads detect the magnetic fields and send the data to the computer.

Advantages

• High Capacity: Magnetic disks can store large amounts of data.
• Cost-Effective: Compared to other storage options, magnetic disks are relatively affordable.

Disadvantages

• Mechanical Failure: Moving parts can lead to mechanical failure.
• Data Corruption: Physical shock or magnetic interference can cause data loss.