This hard disk drive (HDD) option is a high-density, 2.5-inch, slim-high EIDE HDD. This 5400rpm ATA-100 HDD is installed directly on one of the IBM BladeCenter HS20 blade IDE connectors to support internal data storage solutions up to 80 GB. IBM HDDs deliver reliable operation and long life. They undergo qualification and compatibility testing that is among the most rigorous in the industry.