Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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Can't adjust disk sleep settings in El Capitan?

I can't adjust my disk sleep settings for my secondary hard drive in El Capitan.

Any ideas what's causing this? I only use my secondary platter HD for storageand I don't need to have it spinning 24/7 when I am on my laptop.

Even though I typed "sudo pmset -a disksleep 2" into the terminal I find that it defaults to 10 upon reboot.

Any ideas on how to fix it?

Answered! View the answer I have this problem too

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Your only option is to dismount the drive. You might give this app a try: M3 Drive Mounter.

We don't use dual drive setups so I can't tell you if this utility will help.

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This is technically an unauthorized repair from Apple, and the settings that Apple has "hardwired" into the firmware are specifically for disk drives for CDs and DVDs, not hard drives.

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Erik Liska will be eternally grateful.
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