With the SDK installed in Ubuntu, I changed APP_SIZE in the file flash_l4t_t210_spi_sd_p3448.xml to 120000000000 for my 128GB SD card and it worked. I now have almost all memory available.
Can you tell me where can i find the file, i too have the same issue flashed images using SDK manager into jetson nano, it is 64GB card showing only 16GB.
Do we have to change before flashing or after flashing would do it ?