Linux

48624 readers

1609 users here now

From Wikipedia, the free encyclopedia

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).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

Rules

Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
No misinformation
No NSFW content
No hate speech, bigotry, etc

Related Communities

Community icon by Alpár-Etele Méder, licensed under CC BY 3.0

founded 5 years ago

MODERATORS

[email protected]

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?

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 7 points 1 year ago (1 children)

Your output from dmesg didn't paste.

Does the card appear in lsblk? Also try cleaning any dirt off the microSD

[–] 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