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I split my SD card into 2 partitions. When I use usb-card-reader to read my sd card, only the one partition shows up on the screen, and the other doesn't. I have run the command sudo fdisk -l and the result is the same -- only one partition is recognized. But I believe both partitions of my sd card work, because I can boot my single-board computer with the sd card and run some of the programs which are inside that "unreadable" partition.

How can I access both partitions of my sd card?

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Can you check, if you see more than one partition with the partition manager gparted (you'd need to install it, as it's not part of the default installation)? – htorque Feb 3 '11 at 9:59
Hi, thanks for your answer. I have already used gparted to check the sd card, and there's also only one partition is appeared. – user10126 Feb 3 '11 at 11:19
Can you post the output of sudo fdisk -lu and sudo blkid? What do you expect to find in the way of partitions? (How large, what filesystem, etc) – Jordan Uggla Feb 12 '11 at 23:03

You can use Testdisk to fix partition table and recover missing partitions. To install Testdisk :

sudo apt-get install testdisk

To use it :

sudo testdisk

And after that you have a official step-by-step tutorial here :

P.S : Don't worry it's pretty easy and don't take long and you don't risk to lose your files (you can make a backup anyway if you want) and if you messed up with the partition table just run testdisk again and fix it

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