I NEEEEEVER play around with non-redundant drive setups... after losing 2, yes TWO 750GB drives during a got damn BACK UP... I vowed to never be with out multiple backups again! I'm still recovering from the data loss and that was years ago. I'll be searching for something for hours, swearing I DL'd the file(s) and then remember "oh.... it was on the 750GB...FSCK!" Now I've got 3 500GB drives 1 mirrored and stored away, the other as a mirror for it's 500GB twin.
Drives these days ARE more prone to bad/failing sectors and errors, as they add a ton more extra blocks to replace any future blocks going bad. I think drives today are less reliable, but that could be bc of the advent of the internet/forums where more people can report on said issue vs a decade or so, where it was just word of mouth and pure hearsay from a "friend" blah blah... Sucks though buying drives in pairs and triplets $$$. My next storage upgrade is going to be 2x2TB; man that's going to cost a lot! BUT... when disaster strikes, there's almost nothing better than saying... "Fsck... guess I'll pop in the mirror! HAHA!" 10min down time and a huge sigh of relief!
PS- Why aren't the B/I/U and smiles working? I cannot get any of them to show; I click the icons and nothing appears?