Information Communication Technology ICT – 3 Storage devices and media | e-Consult
3 Storage devices and media (1 questions)
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A magnetic hard disk (HDD) stores data using magnetic fields. The key components are:
- Platters: These are circular disks coated with a magnetic material. Data is stored magnetically on the surface of these platters.
- Read/Write Heads: These heads float very close to the platter surface. One head is responsible for reading data, and the other for writing data.
- Actuator Arm: This arm moves the read/write heads across the platter surface to access different areas.
- Spindle Motor: This motor spins the platters at a constant speed.
Data Writing: To write data, the read/write head generates a magnetic field that magnetizes tiny areas on the platter surface, representing 0s and 1s. The direction of the magnetic field determines the bit value.
Data Reading: To read data, the read/write head detects the magnetic fields on the platter surface. The head senses the direction of the magnetic field and converts it into electrical signals, which are then interpreted as 0s and 1s.
Data is organized into sectors, tracks, and cylinders on the platters. The actuator arm moves the read/write heads to the appropriate track and sector to access the desired data.