I would love to hear long-term experiences with Raspberry Pi (1/2/3), Resin.io.
Anyone ever experienced SD Card wear? Anyone ever had any other issues that came from long-term operation? What are your long-term projects? How long is long-term in your particular project?
Feedback greatly appreciated!
Simon
I think on the team @lifeeth, @curcuz, and @jviotti have some experience with SD cards, for different reasons (AutoHAT, lots of projects, and working with etcher, respectively), I wonder if they have noted down something yet? I remember hearing recommendations for industrial-grade SD cards that did work well, and remember also that the power supply is what affects the SD card wear a lot, but there has to be more than that…
From some internal discussion, apparently SanDisk Extreme Pro is the “best SD card money can buy” (paraphrasing, and it’s not an endorsement 
)
https://www.amazon.com/SanDisk-Extreme-MicroSDHC-Memory-SDSDQXP-016G-X46/dp/B008HK1YAA/
Thanks for the feedback. @imrehg So let me share my experiences I was able to make so far - using Raspberry with Raspbian:
I have a device that’s currently running for more than a year on the same SD-Card. This device is constantly logging sensor data and stores a new data-frame every 5 minutes. I have disabled logging, swap, and moved temporary file systems onto a ram-disk.
There is a very good question on Raspberry StackExchange about this which has very detailed and good answers.
Using industrial SD-Cards
I have made some tests with using industrial-grade SD-Cards which all use SLC-Flash cells. SLC stands for single layer cell. Consumer grade (which also includes the SanDisk Extreme Pro Card mentioned above) mainly uses MLC - which stands for Multi Layer Cells.
In theory SLC Cards have much longer lifetime than MLC Cards. But SLC Cards are up to 10x more expensive. So a 16GB Card might cost up to 200$.
So the trick is to shrink the image to a smaller size here. But even if you use a 4GB or 2GB sized SLC card you will likely end up using almost 100% of the cards space.
If that SLC Card now has a defected cell its damage-repairing-controller won’t be able to use free cells and map that defective one to a freshly new one.
MLC Cards with high capacity - like that 16GB Card from above - can remap defective cells quite often. Especially when the image on the card is just using a maximum of just 50% of the capacity.
So SLC has more write(/read) cycles but is also more expensive - especially when you are looking for higher capacity.
MLC has less write(/read) cycles but is less expensive so you can easily add up free capacity which can be used by the flash-controller to map defective cells to fresh new ones.
If you compare a low capacity SLC with a large capacity MLC you probably get the same lifetime results.
By the way we are using that SanDisk Extreme Pro in our projects! 
Looks like on Twitter there are some endorsements for Samsung Evo cards as well.
Outright I have to state that you should worry about “wear levelling”, a feature where data is written in only come sections of the SD card leading to early wear in the parts.
I have read many posts on Raspberry Pi 3 and the Raspberry Pi 3 SD cards. Samsung EVO Plus and SanDisk Extreme PRO have been endorsed as the best for even the latest Pi3.