Product manual

Installation

4-8 DiamondMax Plus8 20/30/40GB AT

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 DiamondMax Plus8 drives is

shown in the following table:

Figure 4-5 AT Connector and Jumper Location

AC JUMPER OUT AC JUMPER IN

20GB

C=16,383

H=16

S=63

LBA=40,718,160

C=4,092

H=16

S=63

LBA=39,876,479

30GB

C=16,383

H=16

S=63

LBA=60,058,656

C=16,383

H=16

S=63

LBA=66,055,247

40GB

C=16,383

H=16

S=63

LBA=80,293,248

C=16,383

H=16

S=63

LBA=66,055,247

Pin 1 JPM Pin 1

29.78±0.50

(to pin center)

4.55±0.50

7.22±0.50

(to pin center)

Pin 1 of AT Connector

Connector Side