From: James Bensley <jwbensley at gmail.com> > I have a 5.5 box and I have formatted a partition as ext4 however I > can't mount it, the mount command is telling me its an unknown file > system type. fsck tells me the partition is a clean ext4 partition but > I can't mount it. > Some reasearch has lead me to believe the problem is that ext4 isn't > enabled in the kernel by default in 5.5 (this was originally a 5.2 box > that has been upgraded over time, its now on 2.6.18). I guess you have e4fsprogs installed? I saw some people use tune4fs -E /dev/sdxx before trying to mount... JD