Storage devices
Storage
devices are used to keep data and documents saved from RAM, so when the
computer is switched off they are kept safe for another time. They are also
used to keep programs for loading into RAM when they start so the CPU can run
them.
HDD
(hard disk drives)– These are magnetic media, as they can use tiny magnetic
spots on a disk surface to store data. The disk spins round using circular
tracks to organise the magnetic spots with a read/write head moving over the
disk surface between tracks to use them.
SSD
(solid state drives) – These store data in flash memory microchips which
contain transistors that retain their state (on or off) and store the data,
even when there’s no electrical power supply. Although currently HDD are
genrally cheaper and can have larger capacities, this is beginning to change
and SSD is becoming increasingly popular and more common.
They
are same physical size as a HDD with the same connections and functions, but
they don’t have any moving parts so are a lot more faster, quitter, and more
reliable then HDD.
Optical
drives – items such as DVDs, CDs are used to install new software and to make
backups of hard disks.
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