Seagate DiamondMax 21 Manual download pdf (Page 32)

26 DiamondMax 21 PATA Product Manual, Rev. B

3.3.3 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 5 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 sens

ing 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).

3.4 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 6 for drive mounting dimensions. Follow these important mounting precau-

tions 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.

• 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.

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 gray connector

to the slave.

Computer

otherboard

Pin 1

Master

Slave

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 49 50

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Seagate DiamondMax 21 Manual Page 32