How is data typically stored on a magnetic disk used in secondary storage?
2025
How is data typically stored on a magnetic disk used in secondary storage?
- A.
Through magnetic patterns recorded on a rotating platter
- B.
By optical encoding of pits and lands
- C.
In non-magnetic semiconductor chips
- D.
By using electrical charges in static memory cells
Attempted by 36 students.
Show answer & explanation
Correct answer: A
A magnetic disk consists of one or more rotating circular disks coated with a magnetic material, called platters. A read/write head flies micro-inches above the surface of these spinning platters. To store data (binary 0s and 1s), the write head uses an electromagnet to alter the magnetic orientation (polarization) of microscopic spots on the platter's surface. These magnetic patterns remain stable even when the power is turned off, providing non-volatile secondary storage.