HP 849956-001 is a SATA data cable assembly for connecting a compatible drive within a computer. Its SATA 3.0 specification identifies the interface, while the 280 mm length describes the cable itself. The listing identifies this configuration as ST-RA, making the exact part number useful when matching a replacement cable to an existing setup.
This assembly is intended for SATA data connection. Its defined length can help with routing between drive and system connection points where that cable size is appropriate.