SATA--Serial Advanced Technology Attachment--cables are a type of cable used in computers to transfer information from storage media like hard disks and CD drives to the computer's motherboard. If you've run out of SATA connectors inside your computer and you don't feel like uninstalling any current SATA drives, you can use a SATA-to-USB adaptor and connect the drive to a USB port on your computer.
Plug the SATA-to-USB adaptor's power supply into a power outlet and connect the other end to the matching jack on the drive. The jack should have four small circular openings lined up beside each other.
Connect the hard drive's SATA cable to the SATA port on the adaptor.
Plug the USB end of the adaptor into a USB port on your computer. The computer should automatically recognise and install the drive attached to the adaptor like a regular external USB device.