Western Digital Ultrastar DC HC310 - SATA bist (Built-In Self-Test)

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Western Digital Hard Disk Drive OEM Specification
9.14 SATA BIST (built-in self-test)
The device supports the following BIST modes, and begins operations when it receives BIST Activate FIS.
F – Far End Analog Loopback.
L – Far End Retimed Loopback
T – Far End Transmit only
A – ALIGN Bypass (valid only in combination with T bit)
S – Bypass Scrambling (valid only in combination with T bit)