Read/Write ext2 ext3 ext4 on Mac OsX with fuse-ext2
you need the following installed to be able to compile:
Apple X Code + Apple X Code Command Line Tools (you find a download on the Apple Developers Website) + OSX Fuse https://osxfuse.github.io/ (former Fuse for OSX)
go to website https://github.com/alperakcan/fuse-ext2 and follow the instructions.
alternatively go to http://zimt.at/projekte/fuse-ext2_article.html with the alperakcan text + some further explanations on how to handle disks.