Checking Filesystems

[Tim McDonough <tim@mcdonough.net>]

I have a fairly new Debian 3.1 system running Samba that I use as a 
home fileserver. The machine has a 30GB drive set up with / and swap 
partitions.

Recently when running backups from Windows machines I've started 
getting errors that say one or more files don't verify correctly. They 
are not files that are in use at the time of the backup or verify and 
if I perform multiple backups in a row different files will not 
verify. On the last instance of this happening there were 3 files out 
of several thousand that did not verify correctly.

This sounds as if there may be one or more bad blocks. What's the most 
appropriate way to check and/or the filesystem?

Thanks for any pointers to utilities or articles.

--
Tim