The Western Digital Raptor X 150 GB hard drive is a fully compatible, robust internal drive for your PC. Add 150 GB of extra memory to your device, with up to 10,000 RPM ensuring fast read and write speeds for uninterrupted processing - even in resource intensive applications. This drive connects to your existing hardware through Serial ATA ports, ensuring compatibility with a wide range of different computers and rack mounts. A 16 MB buffer and 3 1/2-inch form factor ensures this small, perfectly formed unit has the pace to meet your needs in a size that fits with existing hardware ports. Its clear window allows you to view the inner workings of the drive, while the unit remains quiet enough to prevent distraction and interruption as you work.