On Wed, Jan 02, 2002 at 07:14:18PM -0800, Andy Do wrote: > > Mounting root filesystem > EXT3-fs: ide0(3,3):couldn't mount because of unsupported optional features > (200 0200). > mount: error 22 mounting ext3 This means that the primary superblock of the root filesystem was trashed. Hence, it couldn't be mounted. You *might* have been able to save it if you ran e2fsck (or fsck.ext3) after you booted from the rescue CD. Unfortunately, we'll never know, since the first thing you did was a "mke2fs" command, which (as Andrew Morton mentioned) reinitialized the filesystem. If you had run e2fsck, it might have been able to use the backup superblock in order to recover the filesystem. - Ted