The Serial ATA standard provides for the adoption of a 15-pin drive power connector, replacing the ubiquitous 4-pin Molex connector. However, existing system cases and power supplies may have an insufficient number of SATA power connectors, while still retaining the older Molex connectors.This 8" adapter cable plugs into a 4-pin Molex power plug and provides a single 15-pin SATA power connector, with a locking latch so that your connection does not come loose due to movement or vibration.