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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?

Thanks!

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1 Answer 1

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

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