Physical Format
of
Hard Disks
CYLINDER, HEAD, AND
SECTOR
ADDRESSES
Each
track
consists
of
ID
sections (cylinder, head,
and
sector addressing fields)
followed by
data
areas, in the following format.
ID
SECTION
Sector Address
Head
Address
Cylinder Address
In
the
ID
section
of
a
bad
track, the cylinder, head,
and
sector addresses are all
FFH.
A
track
with
an
ID
section
not
equal
to
FFH
but
with its most significant bit set
to
1
is defined as a permanent bad track. A
permanent
bad
track
is
a
bad
track
which has
already been detected
upon
the shipment from the factory
and
has been identified by
the
manufacturer
by setting
on
the LSB in the head address in the
ID
section. (The
shipment
of
a
hard
disk having a
bad
track
is
permissible where the
number
of
bad
tracks detected
is
less
than
the number specified by the manufacturer.)
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