SINGLE BULK PACK. WD Black WD1600BEKX 160 GB SATA 6 Gb/s 16 MB cache 7200 RPM 2.5-inch internal 9.5 mm hard drive. WD Black hard drives are designed for enthusiasts and creative professionals looking for leading-edge performance. These 2.5-inch mobile drives are perfect for high-performance applications like photo and video editing, gaming and power PCs. The SATA 6 Gb/s interface provides greater flexibility for use with the latest chipsets as well as backwards compatibility to legacy systems with SATA 3 Gb/s requirements. (BPKX and BEKX models only).