Large Hard Disk Reliability Question ( 500gb?)

At the MAC store, I have been told twice now by two different "Geniusus" that 750Gb or 1Tb Hard drives are less reliable... than their smaller counterparts.
My Questions:
1) Is this true?
2) Is there data in terms of mean time to failure? (versus 300 or 500Gb)
3) If not, is the reliability issue significant enough? i.e. do what?:
a) buy 500Gb x2
b) buy 750 or 1Tb and backup
c) Other ideas?
I am assuming the same applies to external drives.... true?
Assuming I do not get pursuaded otherwise, I plan to purchase a Hitachi 750Gb. Purpose HD video editing (nothing fancy, just family stuff).
Thanks in advance for any advise out there!!

Having had the Western Digital SE16 750GB for some time as a backup/archive drive I have to say it's done a good job of it. It's now tasked as my Time Machine drive as is seemingly doing well.
What you have to appreciate though is MTBF numbers don't really mean anything as any drive is going to be 100% reliable until it fails on YOU, and this is all anyone can really say over and above what any manufacturer says.
Personally, I recommend backup up in any case so you should always keep this in mind when considering your configuration. Even if you go with smaller drives you should be backing up as there is no such thing as a perfectly reliable drive.
When it comes to performance though the larger, 750GB and up, sized drives do tend to perform substantially better than their smaller counterparts.
So what exactly are your storage requirements and what exactly do you have now?

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