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what does secondary storage store
all data that is not in use
what is a hard disk drive made up of
a stack of magnetised metal disks that spin thousands of times per second
what are the advantages of HDDs over SSDs
HDDs are cheaper
HDDS have a higher capacity
HDDs have longer read/write life than SSDs
what are the advantages of SSDs over HDDs
SSDs are faster
SSDs don’t need fragmenting
SSDs are more shock-proof than HDDs
HDDs make some noise whereas SSDs are silent
why are SSDs more robust
they don’t have any moving parts
Give 3 examples of optical discs
CD
DVD
Blu-ray
what are the advantages of optical discs
they’re very cheap per GB
portable
won’t be damaged by water and shocks
how much can CDs store
around 700MB
how much can DVDs store
around 4.7 GB
how much can Blu-rays store
around 25 GB
why are optical discs use declining
as internet speeds have increased streaming and download services have removed the need for them
what storage device has the largest storage capacity
magnetic tape
what storage device has the least storage capacity
Optical disk
what storage device is the cheapest per GB
Magnetic tape
what storage device is the priciest per GB
SSD
which storage device has the faster read/write speed
SSD
which storage device has the slowest read/write speed
optical disc
why are magnetic tapes often used by large oraganisations in archive libraries
to store huge amounts of data
what are the main functions of an operating system
communicate with internal and external hardware
provide a user interface
provide a platform for different applications to run
allow the computer to multi-task by controlling memory resources and the CPU
deal with file management and disk management
manage the security of the system
What is a peripheral
external hardware connected to the computer
what is a device driver
a piece of software that allows applications to communicate with a piece of hardware
what does a user interface do
provides a way for the user to interact with the computer
what is multi-tasking (OS)
when an operating system runs multiple programs and applications at the same time
what is file-management
the organisation, movement and deletion of files
what is disk management
organisation and maintenance of the hard disk
what is defragmentation
reorganising data on a hard drive to put broken up files back together and collect up the free space
what is flash storage used for
to expand the storage capacity of small devices which are too small for SSDs or HDDs
what is an example of flash storage
SD card
describe the performance of flash storage compared to SSd
much slower read/write times and have a much shorter read/write life