Wed, 25 Feb 2015 11:36:59 +0100 Csányi Pál <csanyipal@xxxxxxxxx>: > 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 --byte
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