Re: Ext2 Group Descriptors (Re: corrupt block makes file system repair impossible?)

Theodore Y. Ts'o (tytso@MIT.EDU)
Wed, 9 Jul 1997 14:58:06 -0400

Date: Wed, 9 Jul 1997 17:57:20 +0000 ( )
From: Benjamin C R LaHaise <>

This is a big problem with ext2 in my opinion - I've trashed filesystems
on my SCSI drive several times while running with an IDE drive (probably
stack overwrites/cruddy ide controller). In 99% of cases I believe the
group descriptors are useless on disk - a piece of information that can
be corrupted, yet e2fsck doesn't give an option to 'fix' it. What
approach can we take to fix this?

Sure it does. What version of e2fsck are you running? Modern ones
explicitly print out a message saying you can use the backup block
descriptors by using the command "e2fsck -b 8193".

- Ted