Det ända jag hittar är detta. Som du borde hittat själv redan.
http://www.linuxjournal.com/article/9449
Citat:
Ext2fsd does not only read ext2 partitions, but also Ext2 was one of the first de facto Linux filesystems, and many new Linux filesystems, such as ext3 and ext4 are backward-compatible with it. Thus, the driver can work with ext3 and possibly ext4.