Electrical Interface Specifications; Cabling; Interface Connector - Hitachi 7K320 - Travelstar Mobile Hard Drive Specifications

7 Electrical interface specifications

7.1

Cabling

The maximum cable length from the host system to the hard disk drive plus circuit pattern length in the
host system shall not exceed 1 meter.
7.2

Interface connector

The figure below shows the physical pin location.
Figure 3. Interface connector pin assignments
 All pins are in a single row, with a 127 mm(.050") pitch.
 The comments on the mating sequence in Table in the section 7.3 apply to the case of back-plane
blind-mate connector only. In this case, the mating sequences are:(1)the ground pins P4 and P12;(2)
the pre-charge power pins and the other ground pins; and (3) the signal pins and the rest of the
power pins.
 There are three power pins for each voltage. One pin from each voltage is used for pre-charge in the
backplane blind-mate situation.
 If a device uses 3.3V, then all V33 pins must be terminated. Otherwise, it is optional to terminate any
of the V33 pins
 If a device uses 5.0V, then all V5 pins must be terminated. Otherwise, it is optional to terminate any
of the V5 pins
 If a device uses 12.0V, then all V12 pins must be terminated. Otherwise, it is optional to terminate
any of the V12 pins.
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7K320 SATA OEM Specification