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I've heard that SD cards on Raspberry Pi's are very susceptible to defects because the Raspberry writes very often to the SD card and this SD cards are not designed for frequent write cycles. Is there an approximate indication of how long the lifespan of a commercially available, inexpensive Class10 SD card in continuous operation approximately is?

How does it look when I take a MLC or SLC SD card. does anyone specifically experience with the following?: https://ch.rs-online.com/web/p/micro-sd-karten/2405456

I've heard that there is a possibility that part of the Raspberry Load the operating system in the RAM, so this does not affect the SD card burdened. What is the point of this thesis and if that would make sense, how do I do this?

And what exactly does disabling the "overlay file system" do? which Do I have any restrictions with this?

I want to build a data logger for my sd card and maybe im Save the data on the SD card every 30 minutes or 1 hour. I am therefore important to all other factors for SD card failure too minimize.

Thanks

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The problem with these questions is that most of the long term regular users around here don't have significant problems with SD cards. In a sense, this makes it an interesting question why some people do. However, an analogy: If you had never ridden in a car before and were thinking of doing so, and then you read somewhere online that car accidents can be fatal, so you started reading more and more reports of such, you might become convinced this was a very risky proposition.

Point being, despite the fact that you could read car accident reports for the rest of your life without even scratching the surface, it still remains reasonably safe. Likewise, literally tens of millions of Pis have been sold, and (although there are no statistics on this), I'd bet 95% spend most of their waking life running off SD cards in read-write mode.

Of course, it is still possible to drive a car in more and less safe ways. WRT to SD cards, the most important caveat is don't make a habit of pulling the plug without shutting the system down properly, especially when the green ACT led is very busy, indicating SD card access.

SD cards on Raspberry Pi's are very susceptible to defects because the Raspberry writes very often to the SD card and this SD cards are not designed for frequent write cycles

Someone should warn people who shoot video on SD cards about this danger! And surely there are many more of them than Pis.

Before you put the cart before the horse, do what you want to do "the normal way" (ie., just like the millions of people who use SD cards in this context) and then if you have problems, have a look at some of the alternates like overlayfs, etc.

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