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

I use SSD instead of optical drive in my Macbook MC516LL, so I have bunch of reasons why I wants to keep HDD's spindle off:

  • Preserve HDD from shock
  • Reduce energy consuming
  • Reduce overall system temperature

I use diskutil umount HD250 and it disappears from OSx. So how can I check if spindle turned off?


share|improve this question
up vote 1 down vote accepted

diskutil umount HD250 - doesn't turn off spindle

diskutil eject HD250 - turn off spindle

confirmd by sound and mA usage

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.