SL to Yosemite startup disk weirdness

From	"M. John Matlaw" <nouser@invalid.com>
Newsgroups	comp.sys.mac.system
Subject	SL to Yosemite startup disk weirdness
Date	2015-03-18 07:10 -0400
Organization	A noiseless patient Spider
Message-ID	<mebmdv$l61$1@dont-email.me> (permalink)

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I guess one instance is a problem and the other is a glitch.  Combined 
in one post as the problem revolves around the same issue.



MacBook Air 3,1 (11-Inch, Late 2010)
HD is an OWC Aura Pro 6G SSD that I installed.
two partitions
First partition       SnowLeopard  (running 10.6.8)
Second partition      Yosemite     (running 10.10.2)
Snow Leopard installed with the Apple memory stick that came with the 
machine (not sure where that is now) and upgraded to 10.6.8.

problem - cannot directly switch system disks from a Snow Leopard 
partition to a Yosemite partition

No problems going from Yosemite to SnowLeopard

On SnowLeopard:

both system drives show up on the desktop.

System Prefs -> Startup Disk  does not show Yosemite

Disk Utility shows both SnowLeopard and Yosemite but the info on 
Yosemite does not show a System Version.

I was a bit panicked when I first switched to 10.6.8 and couldn’t figure 
out how to boot back into the Yosemite partition.  I ended up using an 
external drive (the stock MacAir drive that came with the computer 
mounted into the OWC Envoy custom case that came with the replacement 
drive) that has a bootable Mavericks 10.9.5 partition on it.  That shows 
up in the System Prefs -> Startup Disk choices.  Boot to that and thence 
back to the Yosemite partition on the MacBook Air.




MacBook Pro 8,3 (17-Inch, Early 2011)
two partitions
First partition    Macintosh HD     (running 10.10.2)
Second partition   Macintosh HD 2   (running 10.6.8)
Snow Leopard installed with the Apple DVD installer supplied by Apple 
(SRF2Z691-6799-A)
Not sure what version it installed but it was upgraded to 10.6.8

glitch - Snow Leopard system doesn’t see Yosemite partition on the 
desktop and mis-ids it’s OS version in System Prefs -> Startup Disk

No problems going from Macintosh HD (10.10.2) to Macintosh HD 2

On the Snow Leopard system (Macintosh HD 2 partition):

The system sees Macintosh HD 2 but not Macintosh HD (on the desktop)

System Prefs -> Startup Disk shows 10.7 (not 10.10) on Macintosh HD but 
will restart to it.

Disk Utility shows the Toshiba drive with the first partition as 
Incompatible Format and the second as Macintosh HD 2.  If I select the 
Incompatible Format drive it shows the Mount Point as Not mounted.

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Thread

SL to Yosemite startup disk weirdness "M. John Matlaw" <nouser@invalid.com> - 2015-03-18 07:10 -0400
  Re: SL to Yosemite startup disk weirdness nmassello@yahoo.com (Neill Massello) - 2015-03-18 10:08 -0600
    Re: SL to Yosemite startup disk weirdness David Ritz <dritz@mindspring.com> - 2015-03-18 12:30 -0500
      Re: SL to Yosemite startup disk weirdness "M. John Matlaw" <nouser@invalid.com> - 2015-03-20 08:58 -0400
    Re: SL to Yosemite startup disk weirdness "M. John Matlaw" <nouser@invalid.com> - 2015-03-20 08:54 -0400

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