I have a similar Maxtor which makes a clacking sound as the heads seek data across the platters. This is completely normal and the drive is OK. The software your "friend" was looking for is MaxBlast which is available on the Maxtor site.
The so called "click of death" was associated with one of the IBM Deskstar/DeathStar drives which proved very unreliable, thus launching the fashionable "click of death" mantra amongst the semi informed.
I'd be interested to know whether your "friend's" Maxtor drive is in fact faulty and whether your instant diagnosis of your "friend's" problem was profitable to you to the extent of one Maxtor drive?
Given that your request here is for diagnostic software for your newly aquired drive I wonder whether your technical expertise is based on the "Suck it and see - preferably at someone else's expense" principle or whether you're just a lovable rascal?
I don't have any problems with sharing these pages with rascals as such. It's just that I'd be wary of taking their advice too seriously.