Alternate Capacity (Ac) - Maxtor Quickview 40 Product Manual

Installation
4.3.5

Alternate Capacity (AC)

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 Quickview 40 drives is
shown in the following table:
C=16,383
H=16
20GB
S=63
LBA=40,718,160
C=16,383
H=16
30GB
S=63
LBA=60,058,656
C=16,383
H=16
40GB
S=63
LBA=80,293,248
Pin 1 JPM Pin 1
7.22±0.50
(to pin center)
Figure 4-5
4-8 Quickview 40 20/30/40GB AT
AC JUMPER OUT
Pin 1 of AT Connector
29.78±0.50
(to pin center)
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
Connector Side
C L
4.55±0.50