Retaining
serial
numbers
This
section
includes
the
following
descriptions:
v
“Restoring
the
serial
number
of
the
system
unit”
v
“Retaining
the
UUID”
v
“Reading
or
writing
the
ECA
information”
on
page
62
Restoring
the
serial
number
of
the
system
unit
When
the
computer
was
manufactured,
the
EEPROM
on
the
system
board
was
loaded
with
the
serial
numbers
of
the
system
and
all
major
components.
These
numbers
need
to
remain
the
same
throughout
the
life
of
the
computer.
If
you
replace
the
system
board,
you
must
restore
the
serial
number
of
the
system
unit
to
its
original
value.
Before
replacing
the
system
board,
save
the
original
serial
number
by
doing
the
following:
1.
Install
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.73
or
later,
and
restart
the
computer.
2.
From
the
main
menu,
select
1.
Set
System
Identification
.
3.
Select
2.
Read
S/N
data
from
EEPROM
.
The
serial
number
of
each
device
in
your
computer
is
displayed;
the
serial
number
of
the
system
unit
is
listed
as
follows:
v
20:
Serial
number
Write
down
that
number.
Note:
The
serial
number
of
the
system
unit
is
also
written
on
the
label
attached
to
the
bottom
of
the
computer.
After
you
have
replaced
the
system
board,
restore
the
serial
number
by
doing
the
following:
1.
Install
the
ThinkPad
Hardware
Maintenance
Diskette
Version
1.73
or
later
and
restart
the
computer.
2.
From
the
main
menu,
select
1.
Set
System
Identification
.
3.
Select
1.
Add
S/N
data
from
EEPROM
.
Follow
the
instructions
on
the
screen.
If
the
MTM
and
Product
ID
numbers
differ
from
each
other
on
the
rear
label,
use
what
is
shown
for
the
Product
ID
field.
See
example
below:
MTM
on
rear
label:
TTTT-CTO
S/N
SSSSSSS
Product
ID
on
rear
label:
TTTT-MMM
(Use
this
number
when
setting
Serial
Number)
In
the
example,
the
Serial
Number
to
be
input
is
’1STTTTMMMSSSSSSS’.
Retaining
the
UUID
The
Universally
Unique
Identifier
(UUID)
is
a
128-bit
number
uniquely
assigned
to
your
computer
at
production
and
stored
in
the
EEPROM
of
your
system
board.
The
algorithm
that
generates
the
number
is
designed
to
provide
unique
IDs
until
the
year
A.D.
3400.
No
two
computers
in
the
world
have
the
same
number.
60
ThinkPad
T400
and
R400Hardware
Maintenance
Manual
Summary of Contents for ThinkPad R400
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