The HP 507125-B21 is a performance hard drive from HP that boasts a 10,000 rpm spindle speed that delivers fast, efficient computing. This HP enterprise hard drive has a capacity of 146 GB, enough to store most information on a laptop or server and the serial attached SCSI (SAS) interface allows this performance hard drive to maintain an external data transfer speed of 4.7 Gbps (600MBps). The HP 507125-B21 has a form factor of 2.5” making it ideal in high performance systems and server racks to minimize space and reduce heat buildup. HP 507125-B21 enterprise hard drive is compatible with select HP products such as HP Blade systems and servers.