fsck gave up on me!

[lawrence.petrykanyn at sympatico.ca]

   Hi,
   I have been using FreeBSD 6.2 for a couple of months now with no major
   snags.  Until now.  I did a portupgrade this morning and afterwards,
   when I logged in as a user into Gnome, my desktop was missing most of
   the programs (Accessories, System Tools, etc.).
   I rebooted the machine and "that other" terminal screen came up
   (Single User?) and I was prompted to "run fsck manually" so I did so.
   Well, fsck gave up on me.  I have no idea what happened or why.  Can
   anyone help me understand what is going on with my machine and any
   possible actions I can take to resolve this?


   Script started on Fri Nov  2 17:13:22 2007
   You have mail.
   root# fscd[Kk
   ** /dev/ad1s1a (NO WRITE)
   ** Last Mounted on /
   ** Root file system
   ** Phase 1 - Check Blocks and Sizes
   CANNOT READ BLK: 524544
   CONTINUE? [yn] y
   THE FOLLOWING DISK SECTORS COULD NOT BE READ: 524544,
   ** Phase 2 - Check Pathnames
   ** Phase 3 - Check Connectivity
   ** Phase 4 - Check Reference Counts
   ** Phase 5 - Check Cyl groups
   CANNOT READ BLK: 524544
   CONTINUE? [yn] y
   THE FOLLOWING DISK SECTORS COULD NOT BE READ: 524544,
   CG 2: BAD MAGIC NUMBER
   FREE BLK COUNT(S) WRONG IN SUPERBLK
   SALVAGE? no
   SUMMARY INFORMATION BAD
   SALVAGE? no
   fsck: /dev/ad1s1a: Segmentation fault: 11
   kirkwood# exit
   exit
   Script done on Fri Nov  2 17:14:23 2007

   Thank you in advance,
   Larry