My Mac Mini is getting feedback from External HDD

I am running a external WD 2T Caviar through SATA docking station. I am getting serious HDD feedback throught my speakers. I am using a sheilded Monster Analog stereo cable and it cuts the noise down a little. I have noticed that when playing audio through HDMI to TV speakers there is no feedback. Ijust got this computer and came from a PC. So I am having to get another HDD to back up the info from old drive and the reformat it to apple freindly formating. If I got FW conecting HDD Would FW800 still have the same feedback issues?

Just an update. Tried it and no such luck. I am still getting the same amount of feed back even with the computer and the HDD on seperate outlets. One of the options I am also looking at is since there is no feedback the HDMI is possible just getting a home theater reciever and running video and audio through the reciever. Hopefully that would get rid of the feedback. Again I don't get any feedback through the tv speakers if I run sound through that. So in theroy my afformentioned HT soultion should fix the problem. If anyone sees a flaw in my logic please feel free to speak up!

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Mac mini (Mid 2011) (Verified)
Mac mini - model: Macmini5,2
1 2.5 GHz Intel Core i5 CPU: 2-core
16 GB RAM Upgradeable
BANK 0/DIMM0
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Wireless: en1: 802.11 a/b/g/n
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SA300/350/360 spdisplays_1080p
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: one day 19:4:8
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TOSHIBA MK5065GSXF disk0 : (500.11 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Mac (disk0s2) / [Startup]: 499.25 GB (196.65 GB free)
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Apple Inc. iPad
Apple Computer, Inc. IR Receiver
Canon MG2200 series
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
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Apple Inc. thunderbolt_bus
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Mac App Store and identified developers
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/Library/Application Support/MacKeeper/AntiVirus.app
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