20
Barracuda ATA III Family Product Manual, Rev. B
2.2.4 Ultra ATA/100 cable
An 80-conductor 40-pin cable is required to run Ultra DMA mode 3, mode
4 and mode 5. This cable uses even-numbered conductors connected
to the ground pins to improve signal integrity.
Figure 3. Ultra ATA cable connectors
Note. The drive supports both host and drive cable detection. The host
detects the 80-conductor cable by sampling pin 34, CBLID–, on
the interface bus. The drive detects the 80-conductor cable by
sensing a capacitor at the host side through the CBLID– signal.
The result is reported in a Fast Rise Detected bit (bit 13 of word
93 in the Identify drive parameter block).
2.3 Drive mounting
You can mount the drive in any orientation using four screws in the side-
mounting holes or four screws in the bottom-mounting holes. See Figure
4 for drive mounting dimensions. Follow these important mounting
precautions when mounting the drive:
•
Allow a minimum clearance of 0.030 inches (0.76 mm) around the
entire perimeter of the drive for cooling.
•
Use only 6-32 UNC mounting screws.
•
The screws should be inserted no more than 0.200 inch (5.08 mm) into
the bottom mounting holes and no more than 0.14 inch (3.55 mm) into
the side mounting holes.
•
Do not overtighten the mounting screws (maximum torque: 6 inch-lb).
•
Do not use a drive interface cable that is more than 18 inches long.
Computer
Motherboard
Pin 1
Master
Slave
Note. If you are using a 40-pin 80-conductor
cable, attach the
blue connector to the
motherboard, the
black connector to the
master drive, and the
grey connector
to the slave.
