From the Manufacturer:
With speeds up to three times faster than FireWire 800, LaCie 2big Thunderbolt Series also features RAID security, hot-swappable disks, and daisy chain convenience. Heavy data users can turbo charge their workflow with jaw-dropping speed improvements. And capacities up to 6TB on 7200rpm hard disks deliver the professional storage they demand. Improve your workflow. Get huge data storage. Ensure full data protection.
Use Disk Utility on your Mac OS to configure the 2big Thunderbolt Series into a RAID array that suits your needs. It's possible to set it up as a mirrored RAID set (RAID 1), which provides data protection if one disk fails. Thanks to its removable disks, you can simply replace a disk, with zero data loss and no work interruption.
Alternatively, configure it as a striped RAID set (RAID 0) to maximize speed and capacity for large file storage and fast transfers. It even supports JBOD, which lets you assign each disk to a specific data storage task. For instance, you can put backups for even weeks on one disk, and odd weeks on the other.
LaCie also offers the RAID Monitor software for your 2big Thunderbolt Series. It alerts you when a disk needs maintenance, identifies which drive has failed, and helps you to resolve the issue.
Thunderbolt technology is the most flexible interface ever created. With dual Thunderbolt ports on the 2big, you can daisy chain up to six Thunderbolt peripherals together. That means you don't need to buy a hub to connect multiple devices to a single Thunderbolt port on your computer. In addition, it increases the total amount of storage you can make available to your Mac.
Daisy chaining multiple 2bigs even pushes overall performance to more than 670MB/s for your most data-intensive tasks. Thunderbolt technology is also mini-DisplayPort compatible. For example, you can connect a display and a 2big to your Mac via a single Thunderbolt cable.
The 2big's advanced dual cooling system ensures long-term reliability by preventing overheating. Its solid-aluminum casing provides 60% more surface area, which diverts and dissipates heat more efficiently. In addition, its thermo-regulated fan turns on and off according to internal temperature. As a result, it cools the components while reducing electricity usage. For more energy savings, the front power button even lets you turn off the product without breaking a daisy chain connection.