HOW DOES A HARD DRIVE WORKS ?

Posted by naor malka on January 26, 2026

A hard disk drive (HDD) is composed of a platter that contains compartments to hold data. This data is your operating system, applications, and any files you have created. There is also an accuator arm that moves across the platter to read or write the information requested. To make this process faster, the platter spins as the accuator arm moves across it.

The compartments that hold the data can be spread out all over the hard disk. That is, data is not written sequentially. There is an indexing system to allow the accuator arm to find all of the pertinent data.

The platter and the accuator arm are delicate, so they are covered by a steel case. This prevents damage to the disk under normal circumstances.

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