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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Impossible to read microSD card (self.linux)

submitted 1 year ago by djtech to c/[email protected]

19 comments fedilink hide all child comments

Hello everybody,

I'm trying to read a (probably damaged) microSD card from my computer (tried with two different computers, both Arch Linux, which can read other card without any problems). There isn't any singal of life (no /dev/sdX, nothing with GParted, testdisk, ...); the only thing that I found was in dmesg. Here's the output of sudo dmesg | rg "mmc0":

Any idea on how to resolve?

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[–] djtech 6 points 1 year ago (2 children)

Sorry, this is the output: [ 8306.605559] mmc0: cannot verify signal voltage switch [ 8306.901332] mmc0: error -110 whilst initialising SD card [ 8307.544364] mmc0: cannot verify signal voltage switch [ 8307.837385] mmc0: error -110 whilst initialising SD card [ 8308.488564] mmc0: cannot verify signal voltage switch [ 8308.789314] mmc0: error -110 whilst initialising SD card [ 8582.217859] mmc0: error -123 whilst initialising SD card [ 8584.685053] mmc0: cannot verify signal voltage switch [ 8584.982799] mmc0: error -110 whilst initialising SD card [ 8585.628028] mmc0: cannot verify signal voltage switch [ 8585.926901] mmc0: error -110 whilst initialising SD card [ 8586.573009] mmc0: cannot verify signal voltage switch [ 8586.870849] mmc0: error -110 whilst initialising SD card

The reader can't initalizie the SD card, so no "/dev/sdb" (nothing on lsblk also, obvioulsy).

I'll try cleaning it better, but I already used a napkin.

[–] [email protected] 10 points 1 year ago* (last edited 1 year ago) (1 children)

mmc0: cannot verify signal voltage switch suggests something is wrong with the hardware (either SD card or card reader). -110 is a timeout error, and -123 generally indicates a problem with media hardware.

You're not gonna fix this with software. Try a different card reader, or if you think it's the SD card, put a bit of alcohol on a cotton swab and gently clean the contacts. Let the card fully dry, then try again.

Obviously this is a hail-merry shot, but your card is likely physically done for

[–] djtech 3 points 1 year ago (2 children)

I'll try cleaning it with alcol. Is it a good idea to use pressurized air?

[–] [email protected] 2 points 1 year ago

Use isopropyl alcohol

[–] [email protected] 1 points 1 year ago

Wouldn't hurt, yea

[–] [email protected] 1 points 1 year ago

You can edit your post to add these details