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Or what would you suggest? I mostly do photo editing with PhotoShop. My system is very slow. Would like 500 GB or larger. Right now running El Capitan but would like to format SSD to Snow Leopard from discs. Is this possible? Would use old HD for backup. Nothing on it I can’t be replaced. Sorry, I’m not very tech-ish. Thanks KD

Yes, the Samsung 860 EVO SSD will work in your system. But, if you are planning on sticking with El Capitan you’ll need to enable TRIM manually after you’ve updated the OS to the latest maintenance release 10.11.6. Follow this guide How to Enable TRIM on Third Party SSDs in Mac OS X with trimforce Here is a good guide in using Migration Assistant How to transfer your old Mac’s data to your new Mac. Here will use a SATA to USB adapter cable or a FireWire case to hold your old HDD instead of a second system. StarTech - SATA to USB CableSans Digital - TowerSTOR TS21UB+ FireWire case Here’s the setup process for your new drive How to format a startup drive in El Capitan

yes it will as long as you format it in disk utility! it’ll work a lot faster too. you can boot into an online revery by just holding the option key when you hear the chime and connecting to wifi. then it’ll download the newest available for your MacBook