A hard drive is a data storage device used in computers and other electronic devices. It is a non-volatile storage medium, meaning that it retains data even when the power is turned off. Hard drives are used to store operating systems, applications, and user data.
Hard drives come in a variety of shapes and sizes. The most common type of hard drive is the 3.5-inch hard drive, which is used in desktop computers. Laptop computers use 2.5-inch hard drives, which are smaller and more portable.