Hard drive low pitch whiring / humming noise

I've recently installed a the following IDE hard drive in my desktop system:

Western WD2500JB Digital Caviar SE 250GB 7200RPM ATA/100 8MB Cache

It has developed a low pitched hum that fades in and out every three or so seconds - something like this:

.....wwwWWWWHHHHAAAAMMMMMmmmm...................................wwwWWWWHHHHAAAAMMMMMmmmm..................................wwwWWWWHHHHAAAAMMMMMmmmm......

It does this constantly even when the drive is not in use and is driving my crazy! Is this normal - or does it indicate a possible fault with the drive? Any advice much appreciated.

Regards
Philip
PhilipkAsked:
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CallandorConnect With a Mentor Commented:
I think there's something imbalanced in it - it shouldn't do that.  If it's new, exchange it.
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CallandorCommented:
Are you sure it's the drive?  A hard drive with a bearing problem might make that kind of noise, but I would not expect it to last too long if it continues to do that.
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PhilipkAuthor Commented:
it's definately the drive. I've installed it in two different systems and the same noise occurs.
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PhilipkAuthor Commented:
Thanks for the advice. I'm taking it up with Western Digital now.

Regards
Philip
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