Disk usage utility?

["Chris Brown" <CBROWN@seitz.com>]

Hi all,
    I was wondering if there's a utility like top to see who is 
accessing the drives.  The machine has been going nuts with disk 
access for no obvious reason, and we don't know if it's a program 
running in the background, one of our shell users, or something else.
    Thanks,
    Chris 


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