HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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7.1.2 Voltage and Ground Signals
The 12V and 5V contacts provide all of the voltages required by the drive. The two voltages share a common ground plane to
which all of the ground contacts are connected.
7.1.3 Ready LED output
The drive provides an open-drain driver with 15mA of current sink capability to the Ready LED Output signal. The
cathode of the LED should be connected to this signal. The LED and the current-limiting resistor must be provided by the
enclosure
S9 RS+ SAS Secondary Port Receive
(Positive) signal
S10 RS- SAS Secondary Port
Receive (negative) signal
S11 GND GND for SAS Secondary
Port
S12 TS- SAS Secondary Port
Receive (negative) signal
S13 TS+ SAS Secondary Port
Receive (positive) signal
S14 GND GND for SAS Secondary
Port
P1 +3.3V NOT USED (Pins P1-P3
tied internally)
P2 +3.3V NOT USED (Pins P1-P3
tied internally)
P3 +3.3V NOT USED (Pins P1-P3
tied internally)
P4 GND GROUND
P5 GND GROUND
P6 GND GROUND
P7 +5V-Charge Pre-charge pin for +5V
P8 +5V +5V power supply input
P9 +5V +5V power supply input
P10 GND GROUND
P11 READY LED READY LED output
P12 GND GROUND
P13 +12V=Charge Pre-charge pin for +12V
P14 +12V +12V power supply input
P15 +12V +12V power supply input
Pin Number Signal Description