HGST Travelstar 7K500 BE, 320GB 0A79103 User Manual

Product codes

0A79103

7K500 OEM SPECIFICATION

Page 39 of 176

7 Electrical interface specifications

Electrical interface specifications

7.1

7.1 Cabling

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

7.2 Interface connector

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.