Which term describes the smallest addressable unit on a disk in common terminology?

Which term describes the smallest addressable unit on a disk in common terminology?

• A. Track
• B. Platter
• C. Sector
• D. Cluster

Answer: (C)

The basic idea is how data is physically accessed on a disk. A disk surface is divided into tracks (concentric rings), and each track is further divided into sectors, which are the fixed-size chunks the drive can read or write in a single operation. The sector is the smallest addressable unit on the disk hardware level, which is why it’s the unit you’ll see when imaging or performing low-level data access. File systems, however, group several sectors into a larger allocation unit called a cluster to store files more efficiently. A cluster is a logical, filesystem-level unit, not the smallest physical addressable unit. A platter is the physical surface, and a track is a ring on that surface, neither of which represents the smallest addressable unit. So the term that describes the smallest addressable unit on a disk in common terminology is the sector.

The basic idea is how data is physically accessed on a disk. A disk surface is divided into tracks (concentric rings), and each track is further divided into sectors, which are the fixed-size chunks the drive can read or write in a single operation. The sector is the smallest addressable unit on the disk hardware level, which is why it’s the unit you’ll see when imaging or performing low-level data access. File systems, however, group several sectors into a larger allocation unit called a cluster to store files more efficiently. A cluster is a logical, filesystem-level unit, not the smallest physical addressable unit. A platter is the physical surface, and a track is a ring on that surface, neither of which represents the smallest addressable unit. So the term that describes the smallest addressable unit on a disk in common terminology is the sector.