#│forum
Recommended microSD cards for CM4 system
# │forum
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01dcod3r
04/07/2023, 12:55 PMI’ve got CM4 no eMCC and want to boot from microSD. Probably will mount a separate home partition from SATA SSD.
What speed etc. does the microSD slot on the CM4 adapter support? What specs should I be looking in a microSD for optimal boot drive performance and durability? What brands are recommended for high reliability?
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_dhanos_
04/07/2023, 12:57 PMI'm personally using Samsung EVO Plus and SanDisk Ultra cards. Mostly because I trust them and they're durable. They are not the cheapest, though. But really, about any SD card will be ok for a boot/system partition. You do not need much performance off of it.
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01dcod3r
04/07/2023, 1:06 PMIf the SD was the only storage, system and data partitions, what attributes indicate industrial enterprise grade handling of R/W cycles? Is it viable to run off microSD for very long?
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_dhanos_
04/07/2023, 1:11 PMThis is going to be hard to find and compare
Someone did some jub here already, though: https://www.reddit.com/r/raspberry_pi/comments/xnkp71/reliability_of_microsd_endurance_cards_compared_w/
The cards I mentioned earlier are one of the best choices
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01dcod3r
04/07/2023, 1:15 PMThank you! There are so many specs to consider it’s overwhelming.
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gabbagandalf0
04/08/2023, 12:06 PMYou could also try the raspikey it's eMMC storage that you can plug in a Micro SD slot
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vladvanderwolf
04/08/2023, 7:21 PMIndustrial grade SDcard https://www.kingston.com/en/memory-cards/industrial-grade-microsd-uhs-i-u3 works with Pi400
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_dhanos_
04/08/2023, 9:08 PMI personally would say against Kingston
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vladvanderwolf
04/08/2023, 9:12 PMany particular reason?
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_dhanos_
04/08/2023, 9:14 PMYes, issues with multiple SD cards and a with SSD. I don't know about these cards, but lately the quality of Kingston products went down
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vladvanderwolf
04/08/2023, 9:50 PMthey advertise it as "industrial grade", just got 1 pcs for testing in hot enviroment and summer is comming.
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_dhanos_
04/08/2023, 9:52 PMI'm only sharing my personal experience. Will be interesting to see how it works for you
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01dcod3r
04/09/2023, 1:25 PMThe articles on the Kingston site are helpful.
https://www.kingston.com/en/blog/personal-storage/microsd-sd-memory-card-naming-conventions
I got some Samsung Pro Endurance cards on sale. We’ll see how they do.
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vladvanderwolf
04/09/2023, 3:20 PMi didnt see before (i didnt look in details) other SDcards have Wear levelling and Garbage collection. For any flash device used in desktop or server this is important for perfomance and endurance. Write amplification can be tunend with file system.
to make it easier for SDcard and to extend endurance i have nice expirience with Log2ram https://github.com/azlux/log2ram before log2ram SDcard on my Adguard / PiHole RPi setup was failing every 3~6 months and after log2ram it lasted 3 years
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teslamax
04/12/2023, 8:52 AM@geerlingguy also published several posts on his blog about different microSD cards, their specs, and what was genuinely useful, etc.
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