Constant disk activity with 2.3Ghz i7 late 2012 Mac mini

Discussion in 'Mac mini' started by zen, Dec 9, 2012.

  1. zen
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    macrumors 65816

    Jun 26, 2003
    I've only had my new Mac mini a few days, but I've noticed nearly constant hard disk activity, even when the machine is doing nothing.

    My office is nearly silent when I start work in the morning, and I was puzzled by the slight ticking from my computer. I opened Activity Monitor, and under Disk Activity it shows nearly constant activity under writes out/sec, data read/sec, and data written/sec. The amount of data is only about 4k to 500k, but it is constant, and I can hear the hard drive working when the computer is doing absolutely nothing.

    I have 16GB of RAM and a regular factory hard drive.

    It's not a problem and there are no performance issues, but I'm curious. Is this normal computer behaviour?
  2. justperry
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    macrumors 603


    Do you have TimeMachine running on the Mini?

    Open Activity Monitor, select processes for all user in the drop down menu on top and make a screenshot (Command-Shift-4 then hit spacebar and click AM window) post screenshot here.
  3. zen
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    thread starter macrumors 65816

    Jun 26, 2003
    I have Time Machine, yes, but a backup isn't running when I get the disk activity.

    Screenshot posted:

    Attached Files:

  4. benwiggy
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    macrumors 68020

    Jun 15, 2012
    Log messages in Console utility may be of some help. Of course, logging messages is itself a task that writes to disk.
    It could be Spotlight indexing (though that doesn't seem to be evident from your photo), or various other tasks.
    If you had a Fusion drive, then it might even be the OS moving files around.

    I would be worried if there was a constant and continual significant amount of data being written, all the time forever. Otherwise, if performance isn't affected, then you have nothing to worry about.
  5. justperry
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    macrumors 603


    Not much to see, although I see 2 instances of MDworker which is part of Spotlight indexing AFAIK but no processor activity there.
    Are there two active users(2 X MDworker)

    You should also look at how many pageouts there are in Activity Monitor's System Memory.

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