Radio Shack TRS-80 Hardware Manual page 8

The Media
Error
Map
When
you purchase
your hard
disk,
a
few disk areas
called 'tracks"
may
bo
flawed
because
of
minor
defects
in
the
media
or signals
from
external sources.
However,
no
hard disk
is
shipped
with
more
than 3
flawed tracks per
head
nor
more
than 9
{5-tneo.l
or 12
{15-meg} flawed
tracks
in all
Track never contains
flaws.
Before shipment, a
built-in error
detector dfiterminps which,
if
any
tracks
on
your hard
disk are
Hawed.
Wo
then
attach
to
the bottom
of the disk a
Media
Error
Map
containing
this
information.
Keep
tills
map!
Radio
Shack
service technicians
may
need
to refer
lo-
ir,
if
your
drive ever
needs
servicing.
In
addition,
if
you choose
10 initialize
your hard
disk
system
manually you
may
want
to
reffir
to
the
Media
Error
Map
when
for-
matting the hard disk
tfrives.
Manual
initialization is
discussed
in
Appendix
A.
We
recommend
it
only
for
advanced users
who
can-
not
meet system requirements bv usinq the
simpler
initialization
procedure discussed
in
Chapter
4.