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Storage devices and media (why back up data? (backups are also made in…
Storage devices and media
types of internal and external secondary storage devices
magnetic
optical
solid state
types of access
file
record
field
secondary storage media
storage sizes/file sizes
gigabytes (GB)
1 gigabyte = 1000000000 bytes
megabytes (MB)
1 megabyte = 1000000 bytes
terabytes (TB)
1 terabyte = 1000000000000 bytes
kilobytes (kB)
1 kilobyte = 1000 bytes
why back up data?
backups are also made in case the files need to be used elsewhere
backups don't necessarily guard against the effect of a virus
to safeguard against damage caused by hackers
to safeguard against loss of data due to the failure of the secondary storage device