HP 349237-B21 80 GB Internal Hard Drive - SATA/150 - 7200 rpm - 3.5inch - Hot Swappable. HP 3.5inch SATA drive provides the lowest cost per GB for non-mission critical applications with a 50% maximum work load. This hard drive passed a rigorous qualification process, which ensured that this drive is proven to perform in your HP ProLiant server.