Maxtor QUICKVIEW ATA - Manual (Page 19)

Installation
3-4 Maxtor QuickView 400/500GB Serial ATA Hard Disk Drive
3.3 Hardware Options
3.3.1 Serial ATA Interface Connector
The Maxtor QuickView 400/500GB Serial ATA hard disk drive ships with 2 no
connect (NC) pins for the purpose of storing a jumper when not in use. For normal
operations, no action is necessary. However, if your motherboard does not support
the Gen. II (3Gbps) data rate, you will need to limit the data transfer rate by
transferring the jumper to the pins as shown in Figure 3-3 and Figure 3-4.
Figure 3-3
Data Transfer Rate Jumper Pin Options
Normal operation (3Gbps)
Limit Data Transfer Rate (1.5Gbps)