yler@INSPIRONE1505 ~ $ sudo fsck /dev/mmcblk0p2
fsck from util-linux 2.20.1
e2fsck 1.42.9 (4-Feb-2014)
Superblock has an invalid journal (inode 8).
Clear<y>? yes
*** ext3 journal has been deleted - filesystem is now ext2 only ***

Superblock has_journal flag is clear, but a journal inode is present.
Clear<y>? yes
retropie was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Journal inode is not in use, but contains data.  Clear<y>? yes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences:  -(196608--204799)
Fix<y>? yes
Free blocks count wrong for group #6 (0, counted=8192).
Fix<y>? yes
Free blocks count wrong (69052, counted=77244).
Fix<y>? yes
Recreate journal<y>? yes
Creating journal (8192 blocks):  Done.

*** journal has been re-created - filesystem is now ext3 again ***

retropie: ***** FILE SYSTEM WAS MODIFIED *****
retropie: 61252/116400 files (0.1% non-contiguous), 396100/465152 blocks