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I currently have the MacBook Pro Retina 15" mid 2015 with a 1 TB SSD (upgraded) I keep reading everywhere, including @OWC that it’s only upgradeable to 1 TB. I already have that, I need more storage! They did however tell me that the machine is capable of being upgraded. Does anyone know of a compatible 2 TB SSD??

Not sure if this is relevant for yourself anymore, but OWC has a 2TB upgrade for your Mac available now. You can get it here: OWC - Aura Pro X 2 TB SSD I have the same MacBook Pro and I spent a lot of money on it. Just the storage is what I need upgraded. Hopefully this helps!

I have never heard of a 2 TB SSD blade upgrade for a MBP. You could add an SD card for more storage. UPDATE 5/18/19 Looks like OWC now offers upgrade paths.

Quick update: OWC’s 2TB internal SSD is now available for $680. Aura Pro X2 2.0TB Solid-state Drivefor select 2013 and later Macs https://eshop.macsales.com/item/OWC/S3DA

Many persons report (macrumor forum) that they could add a M.2 SSD with an adapter and it seems it work, especially with the mbp 2015. Depending on the adapter, the ssd type and brand it could have issues. High Sierra recommended for this upgrade. I personally think to make this upgrade too.

Does anyone know whether the 2TB APSF APPLE SSD SM2048L will work with the MBP 15 inch mid-2015? I’ve read where others have successfully used this to upgrade their mid-2015 MBP without any of the known (booting) issues with other 2TB upgrades or need to upgrade to High Sierra before install/use. I’m running El Capitan and not in a position to upgrade (can’t afford all the software upgrades it would require and want to avoid SAAS options). More importantly… where to locate/purchase a 2TB APSF APPLE SSD SM2048L. Seems iFixIt does not have any. I have a 2.8MHz, 11,5 with dual graphics and an original 1TB blade.