Data Recovery Glossary > Cylinder

Cylinder is the set of tracks on a multi-headed disk that can be accessed without any head movement. It is the surface formed by identical track numbers on vertically stacked discs. The same numbered tracks of all the platters in a drive make up the cylinder. Cylinder 1 is all tracks numbered 1s, cylinder 2 is all tracks numbered 2's and so on.

At any location of the head positioning arm, all tracks under all heads are the cylinder. The cylinder number is one of the three address components required to find a specific address. The other two are head number and sector number.

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