On Saturday 07 August 2010 11:50, James Bensley wrote: > 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. Are you trying to mount the ext4 partition using Grub? If so, mkfs.ext4 probably created 256-byte inodes, but the version of Grub that come with CentOS can only recognize 128-byte inodes. Recreate the ext4 partition using 128-byte inodes (use the -I option), or upgrade Grub to a non-CentOS version. -- Yves Bellefeuille <yan at storm.ca> "Au Bellefeuille estas malkompetenta juristo au li estas malhonesta; kaj ech tertium datur: ambau malvirtoj en unu homo." -- Heroldo Komunikas, n-ro 447.