the
5.25-1nch disk 53
FIgure
3-4
Anatomy
of
0
525-lrch
disk
1llc
disk itself
is
a
drcubr
sheet
of
plastic
with
a metallic oxide
coating. A flexible plastic
Jacket
conL3ins
and
pr()(cas
the
disk
The
disk jackct protects thc disk
in
l'wQ
w:aVS.
First,
it
keeps
dust,
fingerprints,
and
other
foreign
substances
from reaching the disk
surface. Second,
it gives you
the
means
to
protect the disk's
contents
from
unwanted
changes.
(SCc
'Write
Protecting a 5.25-
Inch Disk.")
TIle jacket also contains a liner that
cleans
and
lubriCHes the disk
when
the
disk spins.
.:. What
kind
0/
disks
10
bllY: Always
buy
high-quality,
name·
brand
disks.
The
cheap,
no-name
disks are
made
of
lower-
quality
materials
and
tend
10
break
down
rather quickly.
When
a
disk
goes
bad,
the
computer
can
no
longer
read
ii,
and
your
work is lost. Although most retailers
know
what you want
when
you ask for a box
of
disks for
an
Apple
II
computer,
you
should
specify single-sIded, double-demtly, soft-sectored,
10·track
disks,
Lc3rning the
partS
of
a disk provides a
good
b;J,ckground for
undclSUnding
how
disks work
and
how
10
lake
are
of
!hem.
Figure
3-4
shows
the
arutomy
of
a
525-inch
disk.
The
5.25-inch disk
1C
ole
noTch
SDl"lC£e
he"a
(()'19
'l
""
.
V
,
/
cceu
open.ng
O~
ErW81
o
JOCot8
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