| Storage devices, which are used to store information perma-
nently (e.g. hard disks and DVD-RW drives, earlier there were
floppy disks). Disk drives are used to read and write data on disks.
A common communications device is a modem (a modula-
tor/demodulator used for converting digital signals to analogue
signals and vice versa to allow a computer to be connected to the
ordinary telephone system).
At the back of a computer there are ports into which we can
plug external devices (e.g. a scanner, a modem, etc.) They allow
communication between the computer and the devices. Modern
desktop PCs have USB ports and memory card readers on the front
panel.
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