Little big disk raid erased


Hello everyone..... I recently bought a Lacie Little Big Disk 1TB and was working fine. Today, at the middle of a file copying, the process unexpectedly quit and a message appeared "disk was not ejected properly". After that this Macbook was not able to recognize it. At Disk the Lacie appeared with its two 500 GB disks separately and in *grey* letters. Because of a fool action I erased one of the RAID partitions, and now only one of the two 500 GB disks is recognized. I tried to re format it but it still shows Only One DIsk.

The OS is 10.6.8, processor is i7 2Ghz and 4GB DDR3