HGST Ultrastar 2.5-Inch 300GB 10000RPM SAS 64 MB Cache Enterprise Hard Drive with Mission Critical Performance (0B24153) 300GB of Hard Drive Storage Capacity High-performance 6Gb/s SAS for reliable data throughput Industry-best performance in a 10K RPM &gt;&gt;2.5-inch form factor 18% faster sequential and up to 15% better random performance than competition Uses 22% less power during operation than competition