SINGLE BULK PACK WD Blue WD7500LPCX 750 GB SATA 6 Gb/s 16 MB cache 5400 RPM 2.5-inch 7 mm Slim internal hard drive. WD Blue hard drives deliver solid performance and reliability while providing you with all the space you need to hold an enormous amount of photos videos and files. These drives are designed for use as primary drives in notebooks and external enclosures.