Usually when it's a feature that either works or doesn't - so it's not a subjective measurement - it's likely that a product does at least technically do what it says it does.
Presumably the argument is that the manufacturers aren't specifically claiming a particular feature, but the disk is behaving in a particular way that just happens to be not what the user expected - so they're not technically lying. This does seem to weaken the idea that they're doing it to improve the chances of people buying it though, if they're not stating it as a feature.
Just out of interest, I've just spent a while trying to see if I can find out what the difference is between the Samsung HE502IJ and HD502IJ - two drives which are identical on paper, but one is sold as 'RAID-class'. Neither are even remotely expensive enough not to lie about their actions, so what's the difference? Well, some forum post claims that one has a 'rotational vibration sensor', whatever that means.
In conclusion, people who try to sell you things are all liars and cheats, and I intend to grow a beard and live out the rest of my days as a hermit, never having to worry about these things again. Perhaps I shall raise yaks.
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