The StarTech 18in SAS 29 Pin to SATA Cable with LP4 Power (SAS729PW18) connects a SAS hard drive to a SATA controller or Host Bus Adapter (HBA). This high-quality, 18-inch (45.7 cm) cable conveniently provides both data connectivity (via a 7-pin SATA connector) and power (via a 4-pin LP4 Molex connector) in a single unit. A crucial point is that the SATA controller must specifically support SAS drives for the cable to function, as standard SATA controllers do not recognize SAS devices. It is a versatile solution for use with SAS external storage devices, HBAs, and RAID controllers, backed by a lifetime warranty from StarTech.