The hard drive (sometimes abbreviated as hard drive, HD, or HDD) of a computer is a device that stores all the software installed on a computer, as well as all the data files created and used by this software. This includes any documents you have created and downloaded, such as photos and music. The data is stored on a stack of disks that are mounted inside a solid encasement. These disks spin extremely fast (typically at either 5400 or 7200 RPM) so that data can be accessed immediately from anywhere on the drive.
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| Inside Hard Drive |
The hard drive is a form of permanent storage (stored magnetically), rather than temporary memory such as random-access memory (RAM). This means that when you turn off the computer, the files remain safely stored on the drive so you can use them again the next time you start your computer. It is connected to the motherboard using an ATA, SCSI, or SATA cable, and are powered by a connection to the PSU (power supply unit).
The hard drive is typically capable of storing more data than any other drive, but its size can vary depending on the type of drive and its age. Older hard drives had a storage size of several hundred MB (megabytes) to several GB (gigabytes). Newer hard drives have a storage size of several hundred gigabytes to several TB (terabytes). If you are trying to find the physical dimensions of a hard drive, their physical sizes are typically either 3.5" for desktop computers or 2.5" for laptops.
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| Physical comparison between 2.5" and 3.5" hard drive |
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