Droning hum from new hard drives

Discussion in 'Mac Pro' started by speekez, Dec 16, 2007.

  1. speekez macrumors 6502

    Joined:
    Nov 19, 2003
    #1
    Greetings

    My MacPro sits inside a wooden desk cabinet. I leave the front door open when working, and the back part of the desk is removed to allow circulation.

    I have the stock 250 and a Western Digital 500 installed. All was fine.

    I just installed two 750GB Western Digital drives (thereby filling up all for slots). When sitting at my desk, I now hear a low droning sound - up, down, up, down... very low pulsing, but present. I think it is resonating with the wooden desks. What steps might I take to dampen this -- feet under the Mac Pro.

    (Ideas aside from removing MacPro from cabinet) :)

    thanks
     
  2. flyinmac macrumors 68030

    flyinmac

    Joined:
    Sep 2, 2006
    Location:
    United States
    #2
    I've had that issue with a few older PC's. What I did, was to place some rubber under the computer (like a mat).

    What worked best, was the rubber mesh material (looks similar to fishnet stockings) that is sold in the kitchen section of most stores. It's usually used to line the cabinets and drawers in your kitchen.

    I found that if I folded it over a few times (making it two or 3 layers deep), that it deadened the sound quite a lot.

    I hope this helps.
     
  3. speekez thread starter macrumors 6502

    Joined:
    Nov 19, 2003
    #3
    Thanks! I have some of that in the house somewhere. I'll give it a shot later after I've turned the machine off for the evening. I'll let you know how it works
     
  4. flyinmac macrumors 68030

    flyinmac

    Joined:
    Sep 2, 2006
    Location:
    United States
    #4
    Hopefully that will solve it for you.

    Let us know.
     
  5. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #5
    Just setting up a resonating beat frequency, those silly aluminum cases and pathetic feet do nothing to damp out vibrations on a hard surface.

    Hopefully that rubber will work.

    Can alway try the neoprene mouse pads also.
     
  6. JesterJJZ macrumors 68020

    JesterJJZ

    Joined:
    Jul 21, 2004
    #6
    My tower floats inside a chamber of plasma. It's pretty quiet.
     
  7. just02 macrumors member

    Joined:
    Oct 27, 2007
    Location:
    Portland, OR
    #7
    Sweet. Aren't those on sale at Best Buy now? ;)

    (Couldn't resist.)
     
  8. Sun Baked macrumors G5

    Sun Baked

    Joined:
    May 19, 2002
    #8
    The typical rube goldberg solution by a nerd to a problem that the floor manager usually solves for 50¢ in 10 seconds.

    Somebody please take the sugar and coffee away from the nerds before they mess with the coke machine.
     
  9. Blogger macrumors 6502

    Joined:
    Jul 18, 2002
    Location:
    Local
    #9
    I envy you.
     
  10. appie57 macrumors 6502

    appie57

    Joined:
    Oct 27, 2006
    Location:
    Netherlands
    #10
    the other thing you can try is to change the frequency of/in your cabinet by adding mass, e.g. a concrete slab:eek: or bricks or extra wood + the rubber and/or the distance between the drives and the wall.
     
  11. Blogger macrumors 6502

    Joined:
    Jul 18, 2002
    Location:
    Local
    #11
    I did experience the harmonic droning after putting in 4 500Gb drives. The case design and hard drive carriers do contribute to this noise, and wooden desktops can amplify it. Some people have cured it just by re-seating the hard drives, a damping material under the computer can help, as can moving it to a different location on your desk (away from room corners would help, too). Some people just lift the latch on the access door, as this also can change the harmonic vibrations of the case. Experimentation usually comes up with a compromise that is liveable.
     

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