I purchased a i5 128GB surface Pro 3 and the beginning of the year. I knew 128GB storage would not be enough but I assumed I could just add an SD card. I purchased an 128GB SD card and yes it worked but it was sloooow. Would be great for some videos on the plane but there was no way I could use it for things I was working on. Then purchased a little WD 1TB USB harddrive. Worked great but the Surface Pro 3 could not power it reliably. I was able to make it work with a Y cable and grabbing power from the USB port on the power adapter. Now I had a bunch of extra junk to carry around and it only worked while plugged into the wall – kind of defeated the purpose of having a Surface Pro 3.
I looked at the fix-it websites and it seems it is darn near impossible to disassemble the Surface Pro 3 to replace the SSD, But then I found Jorge:
And then A couple weeks ago I just did it. The adrenaline was flowing as I did not want to brick such an expensive device, but it all worked out!
… CLICK ON ANY IMAGE BELOW TO SEE IT IN HIGH RESOLUTION …
My mini mill: