Maxtor D740X-6L 20.0 AT Product Manual page 26

Installation
     # N V G T P C V G % C R C E K V [ # %
For user capacities below 66,055,248 sectors (32GB), inserting the AC jumper limits
the Number of Cylinders field 1 to a value of 16,383, as reported in IDENTIFY
DEVICE data word. This allows software drivers to determine that the actual
capacity is larger than indicated by the maximum CHS, requiring LBA addressing to
use the full capacity.
A summary of these effects for the Maxtor D740X-6L drives is shown in the
following table:
C=16,383
H=16
20GB
S=63
LBA=40,132,503
C=16,383
H=16
40GB
S=63
LBA=78,177,792
C=16,383
H=16
60GB
S=63
LBA=117,266,688
C=16,383
H=16
80GB
S=63
LBA=156,355,584
3-8 Maxtor D740X-6L 20.0/40.0/60.0/80.0GB AT
AC JUMPER OUT
( K I W T G   AT Connector and Jumper Location
AC JUMPER IN
C=4,092
H=16
S=63
LBA=39,876,479
C=16,383
H=16
S=63
LBA=66,055,247
C=16,383
H=16
S=63
LBA=66,055,247
C=16,383
H=16
S=63
LBA= 66,055,247