[arch-general] Arch linux doesn't recognises micro SD card

[Jens Adam]

Wed, 25 Feb 2015 11:36:59 +0100
Csányi Pál <csanyipal at gmail.com>:

> mmcblk0: error -84 transferring data, sector 7, nr 1, cmd response
> 0x900, card status 0x0
> Buffer I/O error on dev mmcblk0, logical block 0, async page read

This clearly indicates a hardware/kernel problem, so I don't know why
people are suggesting to paste random config snippets that won't solve
anything.

Simple googling will produce dozens of similar problems, most without
solution.

My guess: Your card reader (which one? lspci/lsusb/dmesg? laptop type and
age?) or its firmware is simply too old to recognize the card.
See https://en.wikipedia.org/wiki/Secure_Digital#Compatibility

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