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microSD card

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patrikg:
To continue the sd card road, have you seen the leepspvideo for raspberry pi and sd cards speeds ?

Raspberry Pi 5 Vs Pi 4. micro sd speed tests
https://youtu.be/DcyCrUv-MLw

xyz-worx:
Hi vinceASPECT,

I fully agree with Juanito. I made my own (bad) experiences with SD-cards
as a boot device. Take a look at this post:

https://forum.tinycorelinux.net/index.php/topic,23724.msg148850.html#msg148850

Maybe it helps.

best xyz-worx

gadget42:

--- Quote from: patrikg on October 19, 2023, 02:54:29 AM ---To continue the sd card road, have you seen the leepspvideo for raspberry pi and sd cards speeds ?

Raspberry Pi 5 Vs Pi 4. micro sd speed tests
https://youtu.be/DcyCrUv-MLw

--- End quote ---
for those who don't have the time or patience to wade through the _tube_ insanity:

--- Code: ---Results: All Pi4 except 128 samsung EVO Pi5 test

braveeagle 32GB
Sequential write speed 21896 KB/sec (target 10000) - PASS
Random write speed 1123 IOPS (target 500) - PASS
Random read speed 3825 IOPS (target 1500) - PASS

alertseal 32GB
Sequential write speed 27970 KB/sec (target 10000) - PASS
Random write speed 1095 IOPS (target 500) - PASS
Random read speed 3796 IOPS (target 1500) - PASS

Adroitlark 32GB
Sequential write speed 36571 KB/sec (target 10000) - PASS
Random write speed 948 IOPS (target 500) - PASS
Random read speed 3656 IOPS (target 1500) - PASS

Kingston 64GB Canvas Go plus A2
Sequential write speed 32251 KB/sec (target 10000) - PASS
Random write speed 1521 IOPS (target 500) - PASS
Random read speed 3621 IOPS (target 1500) - PASS

Samsung EVO select 128GB Pi4
Sequential write speed 30159 KB/sec (target 10000) - PASS
Random write speed 731 IOPS (target 500) - PASS
Random read speed 3400 IOPS (target 1500) - PASS

Samsung EVO select 128GB Pi5
Sequential write speed 46315 KB/sec (target 10000) - PASS
Random write speed 818 IOPS (target 500) - PASS
Random read speed 4220 IOPS (target 1500) - PASS

Magix 32GB A1
Sequential write speed 14021 KB/sec (target 10000) - PASS
Random write speed 1188 IOPS (target 500) - PASS
Random read speed 3333 IOPS (target 1500) - PASS

Lexar 1066 64GB
Sequential write speed 33956 KB/sec (target 10000) - PASS
Random write speed 712 IOPS (target 500) - PASS
Random read speed 3278 IOPS (target 1500) - PASS

Sandisk 64GB Extreme A2 From GoPro
Sequential write speed 32204 KB/sec (target 10000) - PASS
Random write speed 894 IOPS (target 500) - PASS
Random read speed 2077 IOPS (target 1500) - PASS

tcell masstige 64gb
Sequential write speed 22938 KB/sec (target 10000) - PASS
Random write speed 510 IOPS (target 500) - PASS
Random read speed 1938 IOPS (target 1500) - PASS

--- End code ---

mocore:

--- Quote from: gadget42 on October 19, 2023, 02:45:50 AM ---@mocore, huge thanks for your post and good articles!

we've all probably come up against poor performing hardware of all kinds/types.

definitely buyer-beware, buyer-be-aware, and always do maximum permissable due-diligence

--- End quote ---

scrolling past the below quote (spesificly : compatible devices/testing conditions) reminded me of this topic
https://www.samsung.com/uk/memory-storage/memory-card/evo-plus-256gb-microsd-card-mb-mc256ka-eu/

--- Quote ---Performance

    Speed
 Read : up to 130MB/s
 Write : Lower than Read Speed*
Read/Write speed requires compatible devices capable of reaching such speeds
and it may vary among different host devices and testing conditions.
* For products incompatible with UHS-I interface, the speeds may vary subject to different interface conditions
--- End quote ---

wrt/for varying degrees of  8)
>maximum permissable due-diligence

see also : Exploration and Exploitation of an SD Memory Card (by xobs & bunnie)
https://media.ccc.de/v/30C3_-_5294_-_en_-_saal_1_-_201312291400_-_the_exploration_and_exploitation_of_an_sd_memory_card_-_bunnie_-_xobs

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