Radio Shack TRS-80 Owner's Manual page 19

Figure
5.
A
Diskette.
(Catalog
Number
26-305, 26-405,
or
26-406)
©
Storage Envelope.
While a
diskette
is
not
in
use,
keep
it
here.
©
Write Protect Notch.
When
this is
covered,
the disk-drives
cannot
write
(change
infor-
mation)
on
the diskette.
Do
not
pinch the tab
into
the notch
when
you
apply
it. If
the tab
becomes indented, the disk drive
may
not
sense
that the disk
is
write-protected.
Leave
the notch
uncovered
if
you want
to
save
or
change information
on
the diskette.
©
Jacket.
The
diskette
is
permanently sealed
inside this
protective jacket.
Do
not
attempt
to
remove
it.
©
Read/Write
Window. The
disk drive
accesses the diskette surface through
this
window.
Don't
touch the diskette surface.
©
Label.
To
write
on
this label,
use only a
felt-
tipped pen.
Any
other
writing
implement
might
damage
the
diskette.
Diskettes
In
general,
handle
diskettes carefully,
using
the
same precautions
you
use with
tape cassettes
and
high-fidelity records.
A
small indentation, dust
particle,
or
scratch
can render
all
or
part
of a diskette
unreadable permanently.
•
Keep
the diskette in
its
storage
envelope
whenever
it
is
not
in
one of
the
drives.
•
Do
not place a diskette in
the drive
while
you
are turning the
system on
or
off.
•
Keep
diskettes
away from magnetic
fields
(transformers,
AC
motors, magnets,
tvs, radios, etc.).
Strong magnetic
fields
will
erase data stored
on
a diskette.