Originally Posted by da tick 07
It was with a western digital sharespace. 4tb. it lost power and since then I can't see any files
OK, now that's quite different. You need to provide all relevant details up-front if you expect a useful answer.
What you need to do is:
Remove all 4 drives from the NAS, connect them to a PC, and boot from a Fedora Live CD. (The Knoppix CD won't do, and neither will an Ubuntu live CD.) The array can then be accessed via the "NASRAID" entry on the Places menu.
If "NASRAID" doesn't show up in the Places menu, we can move on to manually recovering the array. Let me know what you find.