2012 iMac 27 - Can you ditch the mechanical drive and run blade SSD only?

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2012 iMac 27 - Can you ditch the mechanical drive and run blade SSD only?

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I am looking to upgrade my Mac mini 2014 to SSD. What's the difference will be if I just buy external SSD and run Mac OS there and use that as main?

2012 iMac 27 - Can you ditch the mechanical drive and run blade SSD only?