I think the plan might be something like migrate 500Gb disc to optibay and confirm boot-ability then install SSD and Lion onto SSD, again confirm boot-ability.

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Scenario: Family member's Acer E571 laptop. It's got an i3 processor and 8GB RAM, running Windows 10. It's slow. As. Shit. Family member doesn't want to spend much, so a new modestly-sized (120GB ...

Of course it matters where your SSD it attached, but even the most 'common-sense' ideas deserve to be tested now and again.