My father always used to ask, "Is that something you know or something you've been told?". This is what I have been told. SD cards have logic that spreads the writes around so that no one point gets lots of hits. If you do a complete overwrite - which is what my code does - 1K times, you are reaching the end of the useful life of the device. When I put this to a salesman of SSDs, he did not deny the basic arguments but said that the power consumption more than made up for the shorter life (than spinning rust) and that in most cases, data were written far fewer times than read and that the read speed was a further advantage and and and. But he didn't deny the effective write limit, although I have no hard evidence for the 1K figure I had been told. I'll bet that, over time, the number of writes will increase. The cards I have that have failed most are Verbatim, but I have other reasons for avoiding anything of that brand in future.

Regards,

John Davies