Another take on Using ext SD w/Thunderbolt
A week ago I posted asking for opinions about using a Thunderbolt wired ext SSD to compensate for my lapse in not getting Fusion Drive in my brand new iMac 27"
And thanks to the wisdom of some folks here (or, should I call it 'extremism), I learned about a novel bit of hardware -- the Blade SSD.
They aren't cheap, though OSC told me they will soon sell one. Current ones suitable for use in iMacs, are ones pulled from MacBook Pros. 2nd hand, but in many cases, unused. They are pricey.
I was foraging around today and read articles in Mac World and saw a YouTube video of a guy who clocked the I/O speeds of Thunderbolt. Rated agains USB 3 and other cables.
It seems that any wired connection lags compared to the internal bus. USB 3 is as fast as Thunderbolt for reads, but is slower for writes. I might have that backwards about reads/writes. But my impression is that something external wouldn't equal the internal FD for booting.