Download and install LaCie RAID Manager before connecting the LaCie enclosure to your computer. LaCie RAID Manager gives you:
Download the LaCie RAID Manager installer at http://www.lacie.com/support/raidmanager/.
You can now connect the LaCie enclosure to your computer. See the user manual for your LaCie product for instructions:
The storage in your LaCie enclosure is preconfigured as RAID 5 and formatted for Mac (HFS+).