HDD and other storage devices connectors
SFF-8088 is irimarily used to connect one chassis to another chassis through the use of external multiline cabling. Nowdays it is the most widely used external SAS cable connector.

The SFF-8088 is compliant with the latest 6Gb/s Mini-SAS 2.0 spec, and supports 6Gb/s data transfer protocol. The SFF-8088’s Mini-SAS internal counterpart is the SFF-8087.

Pin
Function
Pin
Number
Pin
Number
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
Tx2+ B8 A8   Rx2+
Tx2- B9 A9   Rx2-
GND B10 A10   GND
Tx3+ B11 A11   Rx3+
Tx3- B12 A12   Rx3-
GND B13 A13   GND

 

A SAS 4x receptacle connector may be used by one or more SAS devices (e.g., one SAS device using
physical links 0 and 3, another using physical link 1, and a third using physical link 2). A SAS 4x receptacle connector shall be used by no more than one expander device at a time, and all physical links shall be used by the same expander port.

The Mini SAS 4x cable plug connector include key slots to allow attachment to a Mini SAS 4x receptacle connector with matching keys.
 

26 pin SFF-8088 Mini-SAS external connector layout
26 pin SFF-8088 Mini-SAS external connector
at the cable
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