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Overview: The new Smart Array 642 Controller (SA-642) is a 64-bit 133 MHz PCI-X dual SCSI channel PCI array controller for entry level hardware-based fault tolerance. Utilizing both SCSI channels (1 internal and 1 external) of the SA-642 allows you to configure up to 20 Hard Drives (6 internal 14 external) to store up to 2.9TB of storage per PCI slot. The SA-642 provides high reliability and increased performance over the Smart Array 532 thus providing excellent value and lowering the total server ownership cost. In addition the SA-642 is data compatible with all Ultra320 Wide Ultra3 and Wide Ultra2 drives offering an unparalleled degree of investment protection. Designed and integrated with HP entry-level and workgroup ProLiant servers this product provides worry-free data protection. The Smart Array 641/642 Controller provides ProLiant DL and ML servers with an entry-level hardware RAID protection for OS and log files where hardware RAID is needed at an entry-level price point.