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microSD card

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vinceASPECT:
Hello there Foum,

sorry to bother the forum but i was just wondering something about Laptops  (generally)

my laptop here has TWO hidden slots.........one is for a MicroSD card and the other is for a SIM card.

it's clear from the BIOS that the machine will boot off a microSD card.
So i expect that the machine
wil also just SEE the microSD card as an internal DRIVE right?   (say 32 gigs).............so i presume
you could just use it as a sort of hard drive then?

Are it's speeds similar to USB 2.0  since i could also boot
from USB right......


thanks
C

Juanito:
You should see the microSD as /dev/mmcblk*

I guess the speed depends on the interface and the card quality. There is also reliability to think about.

vinceASPECT:
okay thanks

mocore:
...i looked breifly .. and found

https://en.wikipedia.org/wiki/SD_card#Speed

https://www.pcworld.com/article/393331/why-your-laptops-sd-card-reader-might-be-terrible.html

+ https://www.youtube.com/watch?v=2U0-0IGTwc4 (Speed test: Laptop SD card slot vs. SD card readers vs. camera USB)


i think perhaps bootloader/hw driver might also have impact 

+ *some more low level hw* must connect the sd to the laptop/pc
how that is configured / acessed likely will have some impact

eg see the codeblock which contains '# Intialize SPI peripheral' in the below link
https://www.digikey.co.uk/en/maker/projects/raspberry-pi-pico-rp2040-sd-card-example-with-micropython-and-cc/e472c7f578734bfd96d437e68e670050

gadget42:
@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

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