Sudden Motion Sensor (SMS) + SSD/HDD questions

Discussion in 'MacBook Pro' started by dapperdee, Apr 29, 2014.

  1. dapperdee, Apr 29, 2014
    Last edited: Apr 29, 2014

    dapperdee macrumors newbie

    Apr 25, 2014
    I'm finding conflicting information whether or not I should disable SMS on my 13" MBP early 2011. I have a 3rd party SSD (840 Samsung Evo) in the main bay and a HDD in the optical bay.

    1. Should I disable SMS with my current setup?
    2. Does SMS even affect HDDs located in the optical bay?
  2. simonsi macrumors 601


    Jan 3, 2014
    No harm leaving it enabled, even if triggered your SSD wont come to any harm from a "park heads" command.

    Yes I believe it does, when triggered the SMS causes the logic board to issue an emergency park head command on both drive interfaces is my understanding.
  3. dapperdee thread starter macrumors newbie

    Apr 25, 2014
    thank u for answering my questions!

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