Installation guide
PC-XT TYPE SELECTION CRITERIA
The
chosen
TYPE
must
be
smaller
or
equal
to
the
actual
disk
drive
you
are
installing
in
BOTH
the
head-count
and
cylinder-count
dimensions.
Further.
it
is
deSirable
to
match
AS CLOSELY
AS
POSSIBLE
the
head-count
between
the
drive-type
and
the
drive
you
are
installing.
For
further
information
on
the
consequences
of
this
parameter.
read
the
section
below
on
CAPACITI
REDUCTION.
PC-AT TYPE CONSIDERATIONS
Drive-type
selection
is
performed
on
PC-AT
type
computers
by
an
internal
"CMOS CONFIGURATION MEMORY"
rather
than
Switches
and
jumpers
as
in
the
PC-X'I'
type
computers.
DISK MANAGER
is
capable
of
analyzing
your
computer's
internal
drive-type
tables
and
correctly
selecting
the
optimum
CMOS
setting
for
you.
if
deSired.
DISK
MANAGER
also
allows
you
to
choose
CMOS
settings
based
on
your
own
criteria.
if
desired.
Further.
if
your
disk
drive
is
a NONSTANDARD
drive
(one
that
does
NOT
have
a
corresponding
entry
in
your
machine's
internal
tables),
DISK MANAGER's
device
driver
will
compensate
for
that.
allowing
partitions
handled
by
the
device
driver
to
use
the
drive's
full
capacity.
See
notes
below
regarding
CAPACI1Y REDUCTION,
and,
if
you
desire
to
select
CMOS
yourself.
see
the
section
immediately
below
on
TYPE
SELECTION
criteria.
PC-AT TYPE
SELECTION
CRITERIA
The
chosen
TYPE
must
be
smaller
or
equal
to
the
actual
disk
drive
you
are
installing
in
BOTH
the
head-count
and
cylinder-count
dimensions.
Further.
if
you
are
installing
a
drive
with
more
than
8
heads
(or
has
logic
which
decodes
all
4
head-select
bits)
you
MUST
choose
a
type
which
either
does
NOT
use
WRITE-PRE C OMPENSATION,
or
has
a "08"
value
for
the
control
byte.
Failure
to
satisfy
the
above
requirements
will
result
in
a
system
which
has
an
extremely
long
delay
on
boot
(2-3
minutes)
and
finally
produces
a DISK
ERROR
message
after
the
delay.
Usually,
the
boot
process
can
then
be
completed
from
diskette.
Finally,
it
is
deSirable
to
match
AS CLOSELY AS
PODSSIBLE
the
head
count
between
the
drive-type
and
the
drive
you
are
installing.
For
further
information
on
the
consequences
of
this
parameter.
read
the
section
below
on
CAPACI1Y REDUCTION.
35