Personally I think a 2TB SSD is a waste. I only put my OS and Apps on a 512GB and everything else is external. That way It is a snack to move computers.
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Everybody has their own workflow. I have a 1 TB ssd on my boot drive and store my photos on external spinning drives. But, when I return from a photo shoot I leave the photos on my ssd to speed up editing in LR and Photoshop. After I have finished the editing, I move all the photos to my external disks. I don't cull and throw away any photos, so after a long photo shoot I often have over 3000 photos (I exposure bracket almost every shot). And my Photoshop PSD files are sometimes huge, over 1 GB because I use a lot of luminosity masks. Sometimes when returning from a trip I have another trip's photos still on my internal ssd because I haven't finished editing this project, and have run out of hard drive space to store the new trip. Thus the need for a larger internal SSD. Granted, if you don't try to keep 6000-7000 Raw photos and many large PSD files on your boot drive, you won't need a 2 TB drive.
