The Hewlett Packard StorageWorks MSA2 AJ735A Hard Drive is 3.5 inches in width, and 1 inch in height. This internal hard drive provides a hard disk storage capacity of 146 GB. The StorageWorks MSA2 AJ735A laptop hard drive has a hot swap feature for quick removal without shutting down your server. This hard drive has a disk rotational speed of 15,000 RPM, providing faster data transfer rates, and lowest data seek times. This internal hard drive also features the SAS interface with a seek time of 3.5 ms. The Hewlett Packard StorageWorks MSA2 AJ735A Hard Drive has an external data transfer rate of 300 Mbps.