Sun Microsystems has long been synonymous with leading edge technology. Now, after years of telling the world "The Network is the Computer", Sun is poised to become the leader in the emerging network-driven economy. Forward thinking organizations are looking to Sun to lead them into the dot com future. And Sun takes its leadership commitment seriously.This product is Sun StorEdge L8500 Expansion module to hold additional 1728 slots, taking the L8500 from 1448 to 3176 total slots. Either this or SG-XL8500-1EXM is required for configurations of 1750 slots and greater. Number of slots accessible is based on cartridge slot expansions purchased. No Rails included; order this part number when ordering more than one expansion module at the same time as this expansion module. Installation included. RoHS-5.