If it's been making that noise for a year then it could just be that's the noise the drive makes, you haven't really said whether you think it's louder than most other hard disks you've heard.
well it is in my newest pc you cant even hear it in my old p3 you hear it but its less then this i was thinking that it could be cause its a 5400rpm but it cnt cause it wasnt that loud 1 year ago i know that 5400 are louser then 7200 and 10000rpm disk
You're right-ish, but that's not directly the reason why though. 5400rpm drives are louder because they're older and the technology to make them quieter hadn't been invented. 7200rpm drives are the quietest because 10k rpm drives have to do too much work to be quiet, as I well know, being able to clearly hear my Raptor over the rest of the PC but not the 7200rpm Barracuda. Your newest PC you say? It'd need to be a good three years old at least to be 5400rpm. Dektop drives of that specification stopped being common a long time ago.
the one with the 5400rpm is from 2002 the pentium 3 is from 2001 and my pc that i use for games is from january 2005 which has a 7200rpm but i upgraded the mb to pci-e one in march this year
Right yeah that sounds about right. If the drive has been making the noise for a whole year, I wouldn't worry too much,especially ifyou only noticed it in your new system (an old HD in a new PC will [bold]always[/bold] sound louder than it seems like it should). Just make sure your data is backed up (which it should be anyway!)