Utility in Snow Leopard to check sectors of external hard drive

I have valuable data on two external hard drives. Is there a utility in Snow Leopard that can be used to check that all the data on the drives is in good condition (that there are no bad sectors on the drive)? If so, please point me to an article, instructions, etc. on how to use it and if not, does a third party vendor make such a utility and if so who and what is it called?
Thanks for the help. I am grateful.

Running Disk Utility as KT helpfully suggested will run basic repairs.
But to find bad sectors, also called bad blocks, TechToolPro will find them. I rarely use TTP though.... to the point where I think I wasted my money. It helped one time, so I guess that paid off considering what Tech's charge.
The only way to fix bad blocks is to back up to another drive and reformat. Clone it over using the free demo of SuperDuper.
Boot up on your install disk; put disk in and restart while holding down the C key till you get the Install screen.
Don't click on install, go to the Installer menu in the upper lefthand corner of the screen, go to Disk Utilities, choose the drive you want to be free of bad blocks, click on the Erase button, click on Security Options And click the Erase button next to it. Don't choose 7 or 9 way zero........(if it asks for it )....it takes forever and you don't need it !
This will map out any bad blocks on your drive. Then clone your backed up data back to the fresh zeroed out drive.
DALE

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