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Let me add a few possibly pertinent details...I am on a 2015 27" iMac, tons of open memory, upgraded to latest Sierra. The file being saved (or not) was on an external drive with 2TB of free space, connected via Thunderbolt. I can't think of any system constraints that would result in this Adobe weirdness.
The largest PSD you can save is 2 GB. Since apps don't always agree on what a gigabyte is, that's 2-ish gigabytes. The size of the file will depend on some compression, which isn't known in advance. And on metadata, which will increase... your file size is obviously borderline. Or Photoshop has done something to store lots of extra info.
Happily, Photoshop offers the PSB (B=big) format for larger files, so once your files get big, use this instead.
Thanks. There is compression in PSD's? Didn't know that. I also find the 50+% increase in file size in this instance going from PSD to (uncompressed) TIFF to be remarkable.
I believe there is some mild lossless compression. Maybe just runlength compression (which would compress exact repeated bytes, especially good for masks).