LaCie external HD partitioned/2, and one of the partitions appears without format?

Hi again. I formatted my notebook and backed up all data in a LaCie external HD with 120gb which is partitioned in 2 drives. When i went to recover the files, one of the partitions appears to be without format, even the name of the unit dissappeared!!! (according to murphy’s laws, it was f*... obvious…)
I know some softwares to recover deleted data, but i suppose a software that scans and fix disk problems, toc and stuff is more suitable…