best hdd diagnostic utility?

what is the best utility for diagnosing a hdd

i like to use the manufacturer diagnostic software, its free and simple. you can download it from manufacturer website.

samsung: hutil
seagate/maxtor: seatools for dos/ seatools for windows
WD: WD data lifeguard

i dont remember the others manufactures diagnose tools.:P

just like me. and HDTach for performance reports.

I think that symantic have good program for this purpose

I like a boot disk like Barts or Ultimate Boot . For software in windows, Tuneup 2008 or WinDoctor from Norton as i6q suggests .

symantic one