Merevlemez, or hard disk drive (HDD), is a data storage device that uses magnetic storage to store and retrieve digital information. It consists of one or more rotating disks coated with a magnetic material, where data is written and read by a moving arm. Merevlemezek are commonly used in computers, servers, and other electronic devices to store operating systems, applications, and user data. Merevlemezler are known for their large storage capacity and cost-effectiveness compared to other storage types, such as solid-state drives (SSDs). However, they are generally slower and more susceptible to physical damage due to their moving parts.