This internal laptop drive from Western Digital is a reliable and high-quality option for those in need of storage capacity. With a storage capacity of 500GB and a 5400RPM speed, this drive is compatible with both laptops and PCs. The drive type supported is HDD and the form factor is 3.5 inches. In addition, the Western Digital AV-GP model has a 32MB cache and an eSATA interface. This drive is perfect for those needing storage for CCTV DVR systems. With dimensions of 5.8 inches in length, 4 inches in width, and 1 inch in height, this drive is the ideal size for those in need of a compact storage option.