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Question: SSD does not show up in System Preferences?

Hi, I am using a Mac Pro mid 2010. The drive I am using now is system 10.10.5 (Yosemite) and working ok however, in system pref. under start up disk I do not see my SSD drive which is OS Sierra. The drive does show up on my computer but can't start with it? I use to. Any thoughts? Thank you!

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Feb 28, 2018 3:49 AM in response to StellarDust In response to StellarDust

Tried option after start up and saw disk icons on monitor. SSD, HD and two recovery drives. (which I have no idea what they are because I don't have any other drives in my Mac with the OS on it)


I selected HD and it boots up but when I go into system pref. again the SSD still does not show up?

Feb 28, 2018 3:49 AM

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Feb 28, 2018 8:34 AM in response to StellarDust In response to StellarDust

Recovery HD (for a specific version of MacOS) is an additional Bootable partition created on the boot drive of that same version. It is created when you do a standard Install of 10.7 or later, and updated when you install a later version.


Recovery HD allows you to get to run support Disk Utility, set Startup Disk, use Terminal, get help online, or Download&Install MacOS.

Feb 28, 2018 8:34 AM

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Feb 28, 2018 8:41 AM in response to Gerald Gifford In response to Gerald Gifford

Hi, Yes, when I did P ram at start up It booted into my SSD but then went into System pref. At first, I didn't see the drives because the icon was locked but I unlocked it and see both disks in Start up disk. However, I am now back on the HD (pic enclosed) and when I go into start up disk in system pref. I only see my HD not the SSD. There is no lock/unlock icon option for some reason? So I would like to know why I can't see it in my start up disk when every other time before I could? I don't want to press option at startup all the time. Never had to do this before. Thanks.User uploaded file

Feb 28, 2018 8:41 AM

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Feb 28, 2018 8:46 AM in response to StellarDust In response to StellarDust

It is possible that drive has some minor damage to its directory that is keeping it from showing up as bootable.


I suggest you run Disk Utility repair/Firts Aid on the drive by Hardware-name, and again by Volume-name (Macintosh HD equivalent).

Feb 28, 2018 8:46 AM

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Feb 28, 2018 10:34 AM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

Did that. Says SSD appears to be OK. Would a reason be that the HD is Yosemite and the SSD is Sierra? or wouldn't make a difference? Also, should I repair the SSD to see if that is the issue or will this hurt the SSD contents on it? I have Drive Genius vers. 3. Would this help and would it be ok to rebuild the SSD? not repair.

Feb 28, 2018 10:34 AM

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Feb 28, 2018 10:46 AM in response to StellarDust In response to StellarDust

Please don't take this wrong, but it seems like you're putting a lot of effort into the very small problem of (holding the 'Option' key down) on boot up. This can be done during a 'Restart' as well.

Maybe it's your HD that has the problem and not the SSD.

Feb 28, 2018 10:46 AM

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Question: SSD does not show up in System Preferences?