I have noticed that my hard drive has been making a steady low buzzing noise recently. I have a Seagate Barracuda 3tb and have had it for about 1 1/2 years. I booted up the pc without it plugged in and the noise was gone, which confirms that its the hard drive. I also checked to make sure that it was mounted correctly and it was, but I am not sure what to do now. It seems to still be working fine, but the noise is very annoying and loud.