Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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?

share|improve this question
Yes, I'm really curious why current Macbook Airs and Macbook Pros even have this option. It seems meaningless? – Steve Bennett Aug 25 '14 at 2:23

There is no advantage or effect on SSDs with the "Put hard disk to sleep". This setting enabled a spinning disk to spin-down while not in use. With no mechanical moving parts, there is no effect on an SSD.

Externally connected mechanical drives will still adhere to the setting.

See Apple Support page: OS X: Saving energy with Sleep

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.