What are the concentric circles on a hard disk called?

Correct option is D

The concentric circles on a hard disk are called Tracks. These tracks are used to store and organize data on the surface of the hard disk. Each track is divided into smaller units called sectors, which contain the actual data.
Important Key Points:
1. Tracks are circular paths on the surface of a hard disk where data is magnetically recorded.
2. Data on hard disks is organized into tracks, which are further subdivided into sectors for easier data access.
Knowledge Booster:
· Sectors are subdivisions of a track and contain the actual data storage units.
· Clusters refer to groups of sectors that are treated as a unit for data storage.
· Blocks are the basic units of data storage in some file systems, particularly in memory storage.
· Cylinders are a set of tracks located directly above and below each other on a hard disk platter.