the buzzing or 'whirring' sound is usually caused by the bearings and if its a constaint noise it will normally only get worse w/time. you might want to make sure the drive is secured in tight, could just be vibration. i would give it a little time, if it does get worse (depending on how old this drive is) call the company and get it replaced.
This is Linux country. If you listen carefully, you can hear Windows reboot...
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