•Install a SATA host adapter that supports autonegotiation, leave the drive jumper block set to “Normal operation” (see Figure 3, page 22 below), and connect the drive to that adapter. This option has the benefit of not limiting the drive to a 1.5 Gbits/sec transfer rate.
3.0 Gbits per second operation
Limit data transfer rate to 1.5 Gbits per second
Jumper block
SATA power connector
SATA interface connector
Figure 3. Serial ATA connectors
4.3Serial ATA cables and connectors
The Serial ATA interface cable consists of four conductors in two differential pairs, plus three ground connec- tions. The cable size may be 30 to 26 AWG with a maximum length of one meter (39.37 inches). See Table 5 for connector pin definitions. Either end of the SATA signal cable can be attached to the drive or host.
For direct backplane connection, the drive connectors are inserted directly into the host receptacle. The drive and the host receptacle incorporate features that enable the direct connection to be hot pluggable and blind mateable.
For installations which require cables, you can connect the drive as illustrated in Figure 4, page 22.
Signal connector
Power connector
Signal cable
Power cable
Figure 4. Attaching SATA cabling
Each cable is keyed to ensure correct orientation. Constellation Serial ATA drives support latching SATA con- nectors.
4.4Drive mounting
You can mount the drive in any orientation using four screws in the
•Allow a minimum clearance of 0.030 inches (0.76 mm) around the entire perimeter of the drive for cooling as a guideline. Please refer to Section 4.5 for final cooling requirements.
•Use only M3 x 0.5 metric mounting screws.
•Four (4) threads (0.080 inches) minimum screw engagement recommended. Also ensure maximum screw length does not bottom out in mounting holes.
•Do not overtighten the mounting screws (maximum torque: 4.5
22 | Constellation Serial ATA Product Manual, Rev. D |