Is my drive dead or is the Mac Hardware Test lying?

Sorry if this seems a double post from the OS X Snow Leopard forum, but realized maybe it would be better to post here.
I was having huge problems with re-occurring "Invalid Node" errors and other disk corruption - I would restore from a back and the problem would be gone - but return a day or two later, three or four times in the last week.
Well I ran the Extended Hardware Test earlier today twice... both time I got the same errors....
"4HDD/11.40000004:SATA(0,0)"
Bascially it said there is a problem with the HDD - I just put this drive in like 10 days ago... So I called the store they said if it is defective I could bring it back. Great! I thought... so I zeroed the drive tonight to ensure there is no data is on it... and for kicks after the 2 hour zeroing I ran the test again... this time there were no errors!!!
Is this hardware testing the 'Hardware' because I am thinking that if the file system was corrupted shouldn't that be a software issue and the hardware test should ignore it.
Now I am wondering... do I try using this drive again now that it is zeroed and clean - or do I return it and re-install my original 160Gb drive that came with the Mac Book (which by the way never had this problem).... is this disk really dying or is the Hardware Test pulling my leg... do I trust the drive or the Hard Test?
What do you guys/gals think?
Cheers,
Chris

Thanks Dave,
I was thinking maybe I will just get my $$ back and go back to the Fujitsu drive that came with the Mac book till my iPhoto and iTunes libs get huge and then look at a larger driver then.
Or get a diff brand... this was a Western Digital - perhaps they are not the best out there.

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