7 +15 pin serial ATA SATA to 7 pin SATA IDE 4P power extension cable adapter. SATA to IDE 4P cable power two SATA hard drives at the same time.
The serial ATA computer bus is a storage-interface for connecting host bus adapters (most commonly integrated into laptop computers and desktop motherboards) to mass storage devices (such as hard disk drives and optical drives), serial ATA host-adapters and devices communicate via a high-speed serial cable.