what is the function of hard disk drive
Hard disk drive A hard disk drive (HDD), hard disk, hard drive or fixed disk[b] is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material. The platters are paired with magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces.[2] Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. HDDs are a type of non-volatile storage, retaining stored data even when powered off.[3][4][5]
Denial-of-service attack A wide array of programs are used to launch DoS-attacks.
Cerebrum With the assistance of the cerebellum, the cerebrum controls all voluntary actions in the body.
Dividend yield Its reciprocal is the Price/Dividend ratio.
Capability Maturity Model Integration Maturity Level 5 - Optimizing
Computer data storage This led to modern random-access memory (RAM). It is small-sized, light, but quite expensive at the same time. (The particular types of RAM used for primary storage are also volatile, i.e. they lose the information when not powered).