Cannot login this morning on RH9.0. It tells that fils system check doesn't pass and it proposes to login in shell as root. In the shell, I try 'fsck.ext3 /dev/hdc', it tells

e2fsck: bad magic number in super-block while trying to open /dev/hdc. Try e2fsck /b 8193

I try, but it repeats the same message.

Can you help me ?

"fsck.ext3 /dev/hdc"

If that is literally the command that you are using then you need to include the partition number in the command. Something like:
fsck.ext3 /dev/hdc2

If you are using fsck.ext3 /dev/hdc2 and your post just has a typo then you are in trouble.

"e2fsck: bad magic number in super-block while trying to open /dev/hdc. Try e2fsck /b 8193"

If your partition cannot be fixed by fsck then you have lost that partition. You should format the partition and either restore it from backup or reinstall.

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Steve Stites