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Date: Fri, 28 Nov 2003 00:56:02 -0800
From: Rishi Chopra <rchopra@cal.berkeley.edu>
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Subject: Problem Booting (Bad Super Block)
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I've started having problems on my FreeBSD box; I've installed FreeBSD 
on this system at least 5 times before without any problems.

This time, the installation took many attempts, and the following error 
message occurs when I attempt to boot up:

/dev/da0s1a:  BAD SUPER BLOCK:  VALUES IN SUPER BLOCK DISAGREE WITH 
THOSE IN FIRST ALTERNATE
/dev/da0s1a:  UNEXPECTED INCONSISTENCY:  RUN fsck MANUALLY

Automatic file system check then fail, the boot process aborts, and the 
system starts in single user mode.

How can I fix this error so that the machine boots normally?  I am 
unable to run fsck from the prompt by just typing 'fsck'....