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To keep using certain legacy software, I've been running my iMac9,1 (mid-2009) computer from an external USB-2 hard drive under MacOSX 10.6.8 (Snow Leopard). All went well until recently, when the volume in question (and a backup on a separate drive) stopped working as a boot disk - it doesn't...

Context: ~2008 iMac (2.26 GHz Intel Core 2 Duo) running Snow Leopard (10.6.8). Wanting to experiment with Yosemite, I downloaded the installer and ran it on a copy of my startup HD. Then I rebooted, played around a bit, and restarted from my usual boot drive. Next time I felt like exploring it...