I think it's for a floppy. Does it have like 4 holes to plug into? If so it's for a floppy drive.
The other end might be standard molex. So molex to floppy. Maybe
yea four holes.
Now on this motherboard I have several sata cables ones are marked SATA 6GB which i think it goes to the SSD
BUT the mobo comes with cables that say "serial ATA" those are for what? HDD? and optical drive?