Western Digital Ultrastar DC HC310 Specifications page 28

6.1.1.1 Signal Connector (SATA)
A Serial ATA device may be either directly connected to a host or connected to a host through a cable.
For direct connection, the device plug connector is inserted directly into a backplane connector. The device plug
connector and the backplane connector incorporate features that enable the direct connection to be hot pluggable
and blind mated.
For connection via cable, the device signal plug connector mates with the signal cable receptacle connector on one
end of the cable. The signal cable receptacle connector on the other end of the cable is inserted into a host signal
plug connector. The signal cable wire consists of two twinax sections in a common outer sheath.
Besides the signal cable, there is also a separate power cable for the cabled connection. A Serial ATA power cable
includes a power cable receptacle connector on one end and may be directly connected to the host power supply on
the other end or may include a power cable receptacle on the other end. The power cable receptacle connector on
one end of the power cable mates with the device power plug connector. The other end of the power cable is
attached to the host as necessary.
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Western Digital Hard Disk Drive OEM Specification