I emailed Kingston technical support to get their answer on the subject
Thanks for contacting Kingston technical support. For those 4 pins, basically they do not have any function. Only SATA connector and power connector of SSD will be connected and used.
I Pushed for more information and got this in reply
Thanks for your reply. Our apologies but they are intended for any use or purpose.
I will make note that in the footer from the email It had
下午 2:02 (下午/xiawu means afternoon in chinese) so this information has come from china and I believe the first point of contact team is trying to say is that the port is not intended for any use or purpose but have done so in poor English however this is an assumption.
I suspect that they are for development/recovery use as I noticed on a picture of a stripped down OCZ Vertex 3 SSD they had 4 un-soldered points on the board in the same location as OP's SSD labeled vcc, tx, rx, gnd
- VCC - Power supply pin
- GND - Ground
- TX - Transmission of data
- RX - Receives data
Note: This SSD is using the same NAND controller SandForce 2281 as the drive shown by OP as per OCZ Vertex 3 tech specs