This Western Digital 640 GB hard drive is reliable and powerful, and it is a great device for providing loads of additional disk space day in and day out. System builders and hardware enthusiasts can take pleasure in the quality and speed of this Western Digital 640 GB hard drive. The Western Digital Caviar Green is an excellent solution for upgrading your computer. Preserve all of your precious software packages, digital camera pics, and large multimedia files without difficulty by making use of the quite large storage space featured on this internal 3.5" hard drive. This Western Digital 640 GB hard drive enables you to access lots of data files, MP3s, and photos in mere moments with its nimble speed. The Western Digital Caviar Green helps you to eke out faster system performance while transferring data, loading software, or backup up your system thanks to its 64 MB buffer. This internal 3.5" hard drive is easy to install, which means you are able to confidently make the most of it in devices compatible with SATA III and SATA I standards. Plus, the Western Digital Caviar Green is highly stable, with sturdy construction, which means you are able to benefit from long-lived trouble-free operation without fearing loss from mechanical breakdowns or disk crashes.