A hard
disk drive
(HDD)
is a data storage device used for storing and retrieving digital
information using rapidly rotating disks (platters) coated with
magnetic material. An HDD retains its data even when powered off.
Data is read in a random-access manner, meaning individual blocks of
data can be stored or retrieved in any order rather than
sequentially. An HDD consists of one or more rigid ("hard")
rapidly rotating disks (platters) with magnetic heads arranged on a
moving actuator arm to read and write data to the surfaces.
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