Being Surface user, I have to rely on SD cards as my primary data storage. Most of big files will be stored long term and "read only", but some folders I will use as cache.

So lets say, if 80% of data will be permanently stored, and 20% will be rewriten every day, should I expect the same wear-out of the card as I would rewrite whole (100%) of the card.

In other words, the "thing" which has limited lifespan is the "controler" who organize the data, or the "data cells" itself ?

Thank you!