I made a bootable disc on an external hard drive, with Yosemite on it.  I am running Snow Leopard on my iMac.  How can I open the Yosemite disc from the desktop on my iMac?  Does the external hard drive need to be connected to my iMac by firewire to

I made a bootable disc on an external hard drive, with Yosemite on it.  I am running Snow Leopard on my iMac.  How can I open the Yosemite disc from the desktop on my iMac?  Does the external hard drive need to be connected to my iMac by firewire to do that?

kahjot wrote:
Snow Leopard's Startup Disk pref can’t see Yosemite volumes. So the only way to switch from Snow Leopard to Yosemite is to do what Niel mentioned. Doesn't matter whether it's connected by USB or Firewire, although performance via FW would be faster.
Are you saying that Yos/10.10, as a volume located in a mounted external drive won't appear as an option in Snow Leopard's Startup Disc, in Sys Prefs? I've never heard this one before. AFAIK any mounted volume, regardless of OS, should appear there. I would think that, if it appears in the Boot Picker/Startup Manager it would also appear and could be booted to from Snow's Startup Disk. I can't test this myself, since I don't have Yos. Is what you are saying documented somewhere?

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