I just ran fsck on my newly bought SD card for my Raspberry Pi and it shows the following output:
fsck from util-linux 2.25.2 fsck.fat 3.0.27 (2014-11-12) /dev/mmcblk0p1: 75 files, 2539/7673 clusters
It doesn't say clean anywhere and exists with error code 1333 (if I do echo $! after running fsck). Is this bad or not? I don't know, sorry.