Concept:A track on a hard disk is divided into smaller arc-shaped storage units called sectors.
Explanation:Hard disk platters contain concentric circular paths known as tracks.
Each track is subdivided into smaller sections called sectors.
A sector is the smallest physical storage unit on a hard disk.
It holds a fixed amount of data, typically 512 bytes in hard disk drives.
A cluster is a group of sectors, not a direct subdivision of a track.
The terms record and row are not standard names for this subdivision.
Answer:The subdivision of tracks in a hard disk is called C. Sector.