Dual Micro SD Card Adapter
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Dual Micro SD card adapter; Not only for raspberry but also others
Can insert dual micro sd card;
It's convenient to use two kind of rasbpeberry pi os;
Note: Please toogle to another card via switch after your turn off your device;
Q: Why my TF card cannot be recognized? There are some errers such as 'mmc0: error -110 whilst initialising SD card'.
1. Make a backup of /boot/cmdline.txt
sudo cp /boot/cmdline.txt /boot/cmdline.txt.bak
2. Edit cmdline.txt file
sudo nano /boot/cmdline.txt #Find this word in the line root=PARTUUID=xxxxxxxx-xx, then replace 'root=PARTUUID=xxxxxxxx-xx' with 'root=/dev/mmcblk0p2' #(those x'es are placeholders, actually they are letters and numbers) # Make sure that file is a single line like it was before.
3. Adding sdhci.debug_quirks2=4 to the end of /boot/cmdline.txt. Keep it all on one line.
Or refer to: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=274554&sid=58e823d579fa5fcbeadde87584069ab6
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