KATHMANDU: CAS Trading House Pvt Ltd has launched LaCie 5big Network External Hard Disk. “With improved and advanced security, it has capacity of up to 7.5 TB (7500 GB) and it supports seven RAID modes including RAID 5 and RAID 6 for more flexibility and superior data protection, states a press note. It uses 25 per cent less energy and has 37 per cent quieter cooling system compared to traditional four disks RAID towers.