Need a larger SSD in my mid 2012 retina macbook pro

Uh, no.

You bought a closed box, it's non-upgrade-able.

"the first MacBook Pro that will be unable to adapt to future advances in memory and storage technology."

http://www.zdnet.com/blog/hardware/want-to-upgrade-that-retina-macbook-pro-tough -luck/20774

Welcome to Apple. 🙂

swissken wrote:

Can I have the 256 GB SSD in my mid 2012 retina macbook pro swapped out for a bigger one?...

It can be done but it's a DIY project and will void your warranty, something you don't want to do with a rMBP. See here for the details and watch the video of what's involved doing it.

In your shoes, I would decide what's constantly used and just has to be on the internal SSD and what can be stored on an external drive for use when needed. You might find that 256 GB will get the job done as long as there's external storage for all the stuff you collect.

swissken wrote:

Thanks. Will it void the entire warranty or only that on the SSD itself?

I can't say. That would be up to Apple and assumes the transplant is uneventful. If anything got damaged along the way I'm sure that wouldn't be covered. Moreover, if you have AppleCare (which, again with the rMBP, is a good idea), I'd expect that would be affected too.

Uh, no.

You bought a closed box, it's non-upgrade-able.

"the first MacBook Pro that will be unable to adapt to future advances in memory and storage technology."

http://www.zdnet.com/blog/hardware/want-to-upgrade-that-retina-macbook-pro-tough -luck/20774

Welcome to Apple. 🙂

A simple Google would have shown you that this answer is so wrong.

Will it void the entire warranty or only that on the SSD itself?

The entire warranty. Apple does not want you to do anything on these "sealed" units/