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Is there any positive (or negative) to checking the power management option "Put hard disks to sleep" when I only have a SSD drive installed?

Is there any difference if I'm connected to another external drive, or Mac in Firewire taget mode?

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Yes, I'm really curious why current Macbook Airs and Macbook Pros even have this option. It seems meaningless? –  Steve Bennett Aug 25 at 2:23

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