I have a Raspberry PI model 2B and tried to install Raspbian and OpenELEC through it. I followed the correct installation procedures and the installation succeeded the first time but OpenELEC was not booting, Raspbian was working fine. Then I went into recovery mode on Noobs and went to reinstall both of them I get an error: Data_Partition:Error mounting file system. This error is shown at the end of the installation procedure. If I restart the Pi it goes back to Noobs OS installation selection. I also tried installing just Raspbian but that didn't work either. Same problem if I try it with Noobs Lite. And I get the ACT LED flashing 7 times after this ( 7 flashes: kernel.img not found).
Edit: I tried flashing the card with Raspbian and it worked fine, no problems resisted. I tested Raspbian for a couple of days and didn't see any errors with the card nor the filesystem. Then I formatted the card and tried Noobs again, the card got corrupt.
My conclusion: It seems Noobs doesnt like my micro-SD for some reason or Noobs is having an issue with the formatting my card.