I accidentally formatted the sd card, does anyone has experience and successfully un-format the SD card that was format from fs100?

lock it now and don't use it. you might try this software for recovery:
Photo Recovery Software to Recover Lost, Deleted Photos - Stellar Phoenix (http://www.stellarinfo.com/digital-media-recovery.htm)
It has worked for me in other situations in the past.. Perhaps other have a better idea but hope this helps.

I've done the same thing on both an sd card and sd card.
Important!!!!!
Don't record or do anything to it.
2- I used a $30 program called card recovery ( think it's cardrecovery.com) and it saved my butt.
Good luck
Bruce Yarock

thank you, let me try

I have tried the Card Recovery

it can read all the data, but the movies are all chopped into small pieces...
it's better than nothing. I think there should be better recovery software out there