Why Does my HDD Spin When My SSD is my Boot Drive?

Discussion in 'MacBook Pro' started by MOKHAN, Mar 3, 2012.

  1. MOKHAN macrumors 6502

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    Mar 19, 2011
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    Toronto, Canada
    #1
    I have a 128GB Crucial M4 in the main bay of my 2011 13" MBP.
    I have the stock 320GB HDD in an optibay. All my boot files/applications/data was copied with Carbon Copy Cloner to my SSD from my HDD.

    The M4 has been set as my boot drive, however, while using my laptop, the HDD still seems to spin. For example, sometimes when I quit an application after leaving my MBP idle for a while, the HDD needs to spin up before it actually quits. I'm not completely sure why this is happening, considering everything is on my SSD.

    Any suggestions?
     
  2. Imsuperjp macrumors 6502

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    Apr 9, 2010
    #2
    I've got the same set up but I dont hear my HDD spin. I did a clean install though if that matters.
     
  3. keith4594 macrumors member

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    Jul 15, 2010
    #3
    because the mbp still has to turn on the hdd
     
  4. MOKHAN thread starter macrumors 6502

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    Mar 19, 2011
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    Toronto, Canada
    #4
    Why is that though? I'm not using it. Is there a way I can disable it?
     
  5. appleguy123 macrumors 603

    appleguy123

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    #5
    It's normally the optical drive that spins to make sure that you don't want to boot off a disk. I think that the HDD is spinning because it's checking for install media.
     
  6. MOKHAN thread starter macrumors 6502

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    #6
    I see
     
  7. /user/me macrumors 6502

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    Feb 28, 2011
    #7
    It could also be that when a hard drive first receives power after a restart it spins up by default.......?
     
  8. MOKHAN thread starter macrumors 6502

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    Mar 19, 2011
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    #8
    That would make sense. Though, I'm confused why my HDD needs to spin up when I quit applications. That must mean my HDD has some information which needs to be accessed, correct?

    I don't completely understand why, all my information is on my SSD.
     
  9. negativzero macrumors 6502

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    Jul 19, 2011
    #9
    Some processes access the HDD, simple as that. Can be system apps or background apps, not necessary apps you open.
     
  10. Erasmus macrumors 68030

    Erasmus

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    #10
    If you don't want to use it for extended periods of time, you can un-mount the HDD by ejecting or trashing it. You can then re-mount the HDD in Disk Utility if when you want to use it again.

    You should be able to either find, or write, an Applescript to do this easily.
     
  11. MOKHAN thread starter macrumors 6502

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  12. dusk007 macrumors 68040

    dusk007

    Joined:
    Dec 5, 2009
    #12
    In my experience
    the save dialog always spins up every hdd in the system.
    Spotlight keeps it from spinning down especially when it tries to initialize a NTFS drive.

    Set the spin down time shorter and the save dialog isn't as big a problem.
    terminal
    > sudo pmset -a disksleep 1
    for 1 minute, default is 10
    Exclude everything on spotlight that doesn't need indexing, especailly all ntfs drives.

    If that still doesn't solve it unmounting helps. With the app Alfred I used to trigger my mount/unmount script. That is quick and nothing spins up unless you tell it too.
     
  13. MOKHAN thread starter macrumors 6502

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    Mar 19, 2011
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    Toronto, Canada
    #13
    If my HD's name is "Macintosh HDD", how do I specify it in that command?
    Thanks.
     
  14. Mal macrumors 603

    Mal

    Joined:
    Jan 6, 2002
    Location:
    Orlando
    #14
    You don't. It applies to the system's settings, not a per-drive basis.

    jW
     
  15. MOKHAN thread starter macrumors 6502

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    Toronto, Canada
    #15
    Thanks Mal!
     

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