This lot of three Western Digital VelociRaptor 2.5" internal hard drives with a silver color and a storage capacity of 300GB each are compatible with PCs. They have a rotation speed of 10000 RPM and support HDD drive types. The interface is SATA III, and the form factor is 2.5 inches. The model number is WD3000HLHX, and the product line is VelociRaptor. The unit quantity is four, and the unit type is a unit. These hard drives have been tested and are in working condition.