SunOS - Instruction Access Exception

Everything worked fine on my SunStation2 for about a week.  This morning when I went to boot the SunOS 4.1.1 kernel a message appeared:

Checksum 54e701df != 5f583357, trying to boot anyway
Instruction Access Exception

My idea is that the disk somehow became corrupted and will no longer boot.  I could really use a quick method to fix the drive without reinstalling everything.
wigginAsked:
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n0thingConnect With a Mentor Commented:
Hi,

   If the disk no longer boot, you'll have to boot from the cdrom
and run fsck on it, hopefully it will fix it. Ctrl-Stop-A to enter the boot prompt mode, insert the cdrom in then type "boot cdrom" after it boot up, type "fsck" and i'll try to check all
the disks on your system and try to fix any problem it could.
   If it can't then you'll probable will have to change the disk
and reinstall the OS.

   Good luck.

-Minh Lai
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