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ST9655 Family Product Manual, Rev. A
3.0 ATA interface
The ST9655 family drives use the industry-standard ATA task file interface.
The drives support 8-bit and 16-bit data transfers. They support ATA
programmed input/output (PIO) modes 0 through 3, single-word DMA
modes 0 through 2 and multiword DMA modes 0 and 1.
The drives can differentiate between a hard reset and a soft reset while
in Sleep mode. You can connect up to two drives on a single AT host
bus. For detailed information regarding Seagate's implementation of the
ATA interface, see the Seagate ATA Interface Reference Manual, pub-
lication number 36111-001 .
3.1 ATA interface connector
The 44-pin drive connector has 2 rows of 22 pins on 0.079-inch (2 mm)
centers (see Figure 5). The mating cable connector is a 44-conductor,
nonshielded connector with 2 rows of 22 female contacts on 0.079-inch
(2 mm) centers. The connectors should provide strain relief and should
be keyed with a plug in place of pin 20.
The ST9655 family drives are designed to support the industry-standard
MCC direct-mounting specifications. When installing these drives in fixed
mounting applications, use only MCC-compatible connectors such as
Molex part number 87368-442 x . For applications involving flexible cables
or printed circuit cables (PCCs), use Molex part number 87259-4413 or
equivalent to connect the drive to the system. Select a connector that
provides adequate clearance for the master/slave configuration jumpers
if the application requires the use of such jumpers. The ATA interface
cable should be no more than 18 inches long.
Dimensions are in inches (mm)
0.079 ± 0.003
(2.00 ± 0.08)
1.654 (42.01)
Figure 5. ATA interface connector for the ST9655 family drives
Note. The I/O connector pins may extend up to 0.010 inches beyond
the edge of the head/disc assembly.
0.152 ± 0.005
Master/slave jumpers
0.020 ± 0.002
0.020 ± 0.002
(0.51 ± 0.05)
(0.51 ± 0.05)
0.079 ± 0.003 (2.00 ± 0.08)
0.158 ± 0.003 (4.00 ± 0.08)
17
(3.71 ± 0.20)
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