Optical
____________________
are
things
like
____________________
,
____________________
and
____________________
-
Ray
discs
.
There
are
different
____________________
of
optical
discs
.
They
are
portable
,
____________________
and
wont
be
damaged
if
they
get
____________________
.
____________________
discs
aren't
used
as
____________________
____________________
because
people
are
using
____________________
services
for
____________________
and
____________________
.
Lots
of
newer
devices
don't
even
have
____________________
disc
drives
.
