microprocessors: central
processing unit (CPU) within
a single chip
Internal memory
While microprocessor is working, it needs to store
program instructions and data in internal memory.
Different devices have different
amounts of internal memory
(bytes)
Digital devices are storage devices.
In addition to internal memory, there
are components that can store data.
E.g. computers contain high capacity
hard disk drives to store terabytes of
data.
hard drive: -main storage -Software and data stored on
computer's hard drive -Bigger the hard drive size, more data can
be stored -Currently measured in gigabytes
Flash memory
type of peripheral that is ideal
for portable digital devices
peripheral: external devices connected
to a computer e.g. printer, microphone
doesn't
lose data
when
turned off
no moving parts so cannot be
easily damaged (solid state)
removable and can be used to
transfer data between devices.
Micro SD
cards-for smaller
devices
SDXC (Extended
Capacity) Card-
stores up to 2TB
USB flash drive - plugs into
USB port -stores up to
256GB
SDHC (High Capacity) card-
stores up to 32 GB
Secure Digital (SD) card -stores
up to 4 GB
WORKED EXAMPLE
Mitch could use a DVD
or CD drive to back
up his video files. a)
State one reason why
DVD is more suitable.
b) Identify one local
storage device, other
than a DVD or CD
drive, that could be
used for backups.
a) DVD's have a larger storage capacity
b) Memory stick