What is the smallest allocation unit of a hard disk?

The correct answer is A. Cluster. A cluster (also called an allocation unit) is the smallest logical unit of disk space that an operating system can allocate to a file. Clusters are made up of one or more sectors (typically 512 bytes each). Disk platters are the physical spinning disks inside a hard drive, and sp

Submitted by kwame.gh· Apr 18, 2026Disk Forensics

Question

Options

ACluster
BSpinning tracks
CDisk platters
DSlack space

How the community answered

(26 responses)

A
92% (24)
B
4% (1)
C
4% (1)

Explanation

A cluster (also called an allocation unit) is the smallest logical unit of disk space that an operating system can allocate to a file. Clusters are made up of one or more sectors (typically 512 bytes each). Disk platters are the physical spinning disks inside a hard drive, and spinning tracks are the circular paths on platters - these are physical units, not allocation units. Slack space is the unused space within an allocated cluster when a file does not fill the entire cluster - it is forensically significant but is not an allocation unit itself.

Topics

#Hard Disk Allocation#Clusters#Filesystems#Storage Concepts

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