It’s a Fujitsu W26361 There isn’t a lot of info about it on the net, all the links are rotten.
You have a sata port. You have to use an external power supply for that. Or maybe one of the pins next to it can supply the required voltage, you can use a multimeter to figure it out if you are brave. I guess the white one labeled PWR should be supply some volts. To be safe you can split the power of the other sata ssd or buy something like this:
Without any more knowledge I would guess at least one of them is an mPCIe. Having 2 sata ports and an 2 mSATA next to it would be strange, they could use the mPCIe for a 3G modem or wifi, it would make more sense in a thin client like this.
If it’s an mPCIe you can buy a sata expansion there and even connect up to 4 sata drives. Looks like something like this: