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?