Quote:
Originally Posted by anamardoll
Thank you!
That post is fascinating - he seems to be claiming that a unrooted NC + SD card with CM7 is all you need in order to switch back and forth between the CM7/stock device? No rooting necessary?? That would be very cool indeed. 
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If you dig a little deeper, the blogger was getting a lot of error messages in one or two favorite apps while running from SD, so he ended up flashing the PhireMod custom ROM (based on CM7) to the internal memory, replacing the stock OS. The stability of SD-booted ROMs seems to vary quite a bit between different SD cards, different NCs, and different apps, but at the very least it's a great way to try out ROMs and see what works and what you like, without altering the stock OS in the least.