Like most, I bought a 2012 MacBook Pro Retina SSD 256GB. I bought an external hard drive to deal with the lack of space, but I got tired of lugging it around. I can't say if this SSD is necessarily faster, but installation was easy. I made a Time Machine backup from my old SSD and restored it in about 3 hours using recovery mode.
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18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
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