there is no huge difference like that.. it's very random. hardware sometimes gets broken, sometimes it's WD, sometimes it's hitachi, it can be anything. then, people, based on personal "misfortunes" judge companies (which is understandable) and tell that some are worse and some are better
of course there is some difference (if the parameters are the same), but for normal user it doesn't matter. if there were some REALY bad and buggy hard drives, you would see it on the extremely low prices and stores wouldn't trust them niether. all above mentioned companies are well known and it's not that any of them were realy terrible. and you wouldn't notice huge difference in the "OMg this has faster read speed and zomg this this one writes faster. what noWZOrz?!?!/1one" (if the parameters are same of course..)
and you have 2 years warranty and they don't give that just for fun. so if you don't like the current one, pick another one or the same one once again.
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