Western Digital (Techsource) XE - Hard drive - 600 GB - internal - 2.5" - SAS 6Gb/s - 10000 rpm - buffer: 32 MB, P/N WD6001BKHG WD XE SAS hard drives provide high performance storage suitable for both enterprise server and enterprise storage applications. The ultra-fast SAS interface enables optimum data reliability, availability, and scalability. In an environment where space and power are limited, the WD XE drives are an effective solution for high performance computing solutions such as power-constrained data centers, database transaction processing, and rack, tower, and blade servers. WD XE delivers high transfer rates, sustained sequential data rates and a fast average read seek time. The small form factor allows more system airflow resulting in lower cooling costs These drives are built with halogen reduced components.