HDD and other storage devices connectors
The SFF-8087 connector is widely used on SAS cards. It carries four SATA/ SAS connections providing up to 12gbps of throughput using SAS or SATA II 3.0gbps devices.

The Mini SAS 4i receptacle connector is the right angle connector defined in SFF-8087 with
the 36 circuit size defined in SFF-8086.
 

Pin
function
Side B
Pin
Side A
Pin
Pin
function
GND B1 A1   GND
Tx0+ B2 A2   Rx0+
Tx0- B3 A3   Rx0-
GND B4 A4   GND
Tx1+ B5 A5   Rx1+
Tx1- B6 A6   Rx1-
GND B7 A7  GND 
Sideband 0 B8 A8   Sideband 6
Sideband 1 B9 A9   Sideband 3
Sideband 2 B10 A10   Sideband 4
Sideband 7 B11 A11   Sideband 5
GND B12 A12  GND 
Tx2+ B13 A13   Rx2+
Tx2- B14 A14   Rx2-
GND B15 A15   GND
Tx3+ B16 A16   Rx3+
Tx3- B17 A17   Rx3-
GND B18 A18   GND

 

The use of the sideband signals by a controller is vendor-specific. One implementation of the sideband signals by a controller is an SGPIO initiator interface (see SFF-8485). Other  implementations shall be compatible with the signal levels defined in SFF-8485.
 

36 pin Mini-SAS SFF-8087 internal plug connector layout
36 pin Mini-SAS SFF-8087 internal plug connector
at the cable
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