Download and install: Fuse for OS X (Make sure to check: MacFUSE Compatibility Layer)
Download and install: fuse-ext2
Open Terminal
Type: sudo nano -c /System/Library/Filesystems/fuse-ext2.fs/fuse-ext2.util
Press: [CONTROL W]
Type in: function mount [ENTER]
Arrow down to:
OPTIONS=”auto_xattr,defer_permissions”
Change it to:
OPTIONS=”auto_xattr,defer_permissions,rw+”
Press [CONTROL X]
Press [Y]
Press [ENTER]
Plug in the SD Card!