LaCie 12big Rack Serial InstallationUser Manual page 24✦ Dual Host, Dual Connection, shown in Fig. 27– Dual I/O module– Supports SAS or SATA drives– Expansion up to 96 drivesNOTE: Direct dock SATA drives will not work with multiple hostconnections.NOTE: The middle port on the module is for future use.2.8. Grounding ChecksPerform these checks to ensure that a safe grounding system is pro-vided.✦ If a Rack Distribution System is being used.– Ensure power is removed from the rack.– Connect the LaCie 12big Rack Serial power cord to therack distribution and the enclosure.✦ If a direct connection is made with the LaCie 12big Rack Serialpower cord, ensure that it is connected to the enclosure.CAUTION: Some electrical circuits could be damaged if exter-nal signal cables or power control cables are present during thegrounding checks.✦ Check for continuity between the earth pin of the IEC 320connector on one of the Power Supply modules and any ex-posed metal surface of the LaCie 12big Rack Serial.Fig. 27 - Expansion Configuration: Dual Host, DualConnection