The
LED's
on
the
drives
are
drive
select/head
load
lights
and
are
activated
only
when
the
head
for
a
particular
drive
is
loaded
on
a
diskette.
They
are
not
power
indicators.
The
disk
controller
has
been
designed
to
load
the
head
and
turn
on
the
drive
motors
only
when
necessary.
When
the
computer
requests
data
from
the
disk,
both
motors
will
activate
and
the
correct
head
will
load.
After
the
information
has
been
retrieved
the
head
will
unload
and
both
motors
will
turn
off
approximately
60
seconds
thereafter.
Just
like
cassette
tapes,
diskettes
are
made
of
magnetic
materials
and
can
be
erased
by
stray
magnetic
fields.
It
is
an
excellent
idea
_
to
back-up
all
important
disks
on
spare
diskettes.
The
following
precautions
should
be
followed
concerning
diskettes:
1.
Return
the
diskette
to
its
storage
envelope
whenever
it
is
removed
from
a
drive.
2.
Keep
diskettes
away
from
magnetic
fields
and
ferromagnetic
materials
which
might
become
magnetized.
Strong
magnetic
fields
can
distort
recorded
data
on
the
disk.
3.
Replace
storage
envelopes
when
they
become
worn,
cracked
or
distorted.
Envelopes
are
designed
to
protect
the
disk.
4.
Do not
write
on
the
plastic
jacket
with
a
lead
pencil
or
ball
point
pen.
Use
a
felt
tip
pen.
5.
Heat
and
contamination
from
a
carelessly
dropped
ash
can
damage
the
diskette.
6.
Do not
expose
diskettes
to
heat
or
sunlight.
7.
Do
not
touch
or
attempt
to
clean
the
disk
surface.
Abrasions
may
cause
loss
of
stored
data.
8.
Flexible
disks
must
be
in
the
same
temperature-and
humidity
environment
as
the
disk
drive
for
a
minimum
of
5 minutes
before
installing
the
diskette
in
the
disk
drive.
These
environmental
requirements
are
as
follows:
Temperature
50°
F
(10°
C)
to
80°
F
(27°
C);
maximum
gradient
of
20°F
(11.1°C)
per
hour
Relative
8% to
80%,
maximum
wet
bulb
Humidity
82°F
(29.4°C)