A vertical stack of tracks on a hard disk platter is called a cylinder.

Name: A vertical stack of tracks on a hard disk platter is called a cylinder.
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A cylinder is a group of tracks on a hard disk that are positioned vertically above each other and share the same radius. This helps in faster data access and retrieval as the read/write head can access all the tracks in a single rotation.

A Vertical Stack of Tracks on a Hard Disk Platter