Which unit of measurement is used to express hard drive speed

#The unit of measurement used to express hard drive speed is RPM (revolutions per minute).

Introduction to relevant knowledge points:

Hard drive:

Hard-Disk Drive, referred to as hard disk, is a major Computer storage media, consisting of one or more aluminum or glass discs.

These discs are covered with ferromagnetic material. The vast majority of hard drives are fixed hard drives, permanently sealed and secured within the hard drive. Nowadays, removable hard drives are becoming more and more popular, and there are more and more types.

Composition:

Mechanical hard disk is mainly composed of magnetic head and magnetic disk. The magnetic head is the key part of mechanical hard disk to read and write data. When a mechanical hard drive is working, the magnetic head writes track data or reads existing data as the disk rotates.

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