LAKSHYA INSTITUTE OF IT EDUCATION - A hard disk drive (HDD), hard disk, hard drive or fixed disk is a data storage device that uses magnetic storage to store and retrieve digital
![Macro photo of HDD / hard disk drive spindle motor with exposed copper stator coils. See 'description' for focus detail Stock Photo - Alamy Macro photo of HDD / hard disk drive spindle motor with exposed copper stator coils. See 'description' for focus detail Stock Photo - Alamy](https://c8.alamy.com/comp/E29962/macro-photo-of-hdd-hard-disk-drive-spindle-motor-with-exposed-copper-E29962.jpg)
Macro photo of HDD / hard disk drive spindle motor with exposed copper stator coils. See 'description' for focus detail Stock Photo - Alamy
![hard drive - What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs? - Super User hard drive - What is the purpose of this 4-pin interface on SATA HDDs and why doesn't it exist on SSDs? - Super User](https://i.stack.imgur.com/oZYUu.png)