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How SD Cards Work - MarkHaysHarris777 - 09-12-2016
How SD Cards Work; SPI and the SD Card
The above link explains how SPI and the SD card work. This is not only a good read for understanding in SD cards, but is also a great primer for understanding SPI as well.
RE: How SD Cards Work - clarkss12 - 09-12-2016
That looks like some of the stuff I had to learn 40 years ago in the electrician trade school. JK flipflops, FIFO, Nands, Nors, ect. I was a industrial electrician and had to service a lot of expensive equipment. The upper echelon would freak when I cleaned $10,000 circuit boards in de-ionized water.