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!
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.
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?
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.
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).
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.
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.
Resetting NVRAM could solve the problem.
Have you tried booting from a complete shutdown and holding the 'Option' key down right after the startup bong?
This should get you a choice of which OS to use for the boot up.
Hi, Ok, I tried option-Command P-R and it shows up but now it booted in the SSD but now the HD is not is ghost out. Will try Option right after start up.
Sorry!
I thought you wanted to boot the SSD. This is a way to boot from another drive when you can't see it in System Preferences.
Why didn't you pick that icon?
That's fine... Thank you! Maybe someday it will appear again.
SSD does not show up in System Preferences?
