Inside the housing of an OCZ Agility 4 SSD I found several additional connectors on the opposite site of the SATA connectors.

What are they good for and how to connect them properly?

PCB top side PCB bottom side

Zoomed: J5 JT ROM

1 Answer 1


J5 looks like a UART connector and the JT_ pins are likely JTAG. UART should give you console access to manufacturing/diagnostic commands, and JTAG should allow you to the debug the code (firmware) running on the controller CPU.

As for J3, at a guess, ROM/FW allows you to switch from the firmware stored in the flash to the built-in CPU boot ROM (e.g. in case flash is corrupted and firmware can't boot properly).

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