[CentOS] Looking for a good disk exerciser

	I recently added a Seagate 400Gb SATA drive to my system, and it
has been behaving strangely since I put it in.  for one thing, the BIOS
S.M.A.R.T. came up with a warning the last time I booted with it
enabled, saying that I should backup my data and replace the disk (!). 
	
	 <snip> 
	What is a good program out there that exercises a disk to give
some assurance of errors or lack thereof? 
	 
	 

 I like this one: http://freshmeat.net/projects/iogen/ 
 
pretty easy to use, and seems to crush systems.
 
Mike
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