1.3 Specialist microprocessors for
1.3.1 microprocessors: central
processing unit (CPU) within
a single chip
2 Internal memory
2.1 While microprocessor is working, it needs to store
program instructions and data in internal memory.
2.2 Different devices have different
amounts of internal memory
3 Digital devices are storage devices.
3.1 In addition to internal memory, there
are components that can store data.
3.2 E.g. computers contain high capacity
hard disk drives to store terabytes of
3.2.1 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
4 Flash memory
4.1 type of peripheral that is ideal
for portable digital devices
4.1.1 peripheral: external devices connected
to a computer e.g. printer, microphone
4.3 no moving parts so cannot be
easily damaged (solid state)
4.4 removable and can be used to
transfer data between devices.
4.5 Micro SD
4.6 SDXC (Extended
stores up to 2TB
4.7 USB flash drive - plugs into
USB port -stores up to
4.8 SDHC (High Capacity) card-
stores up to 32 GB
4.9 Secure Digital (SD) card -stores
up to 4 GB
5 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.
5.1 a) DVD's have a larger storage capacity
b) Memory stick