PiClone

Setup

Main sd card with another on an extension cable and card reader.

Links

https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=35668&p=301919#p301919

http://www.johnaldred.com/moving-linux-to-smaller-sd-cards/

https://github.com/billw2/rpi-clone

https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=13028

Then

sudo fdisk -l 

did show the disk

Device Boot Start End Sectors Size Id Type /dev/mmcblk0p1 8192 137215 129024 63M c W95 FAT32 (LBA) /dev/mmcblk0p2 137216 31422463 31285248 14.9G 83 Linux

Disk /dev/sda: 14.9 GiB, 15931539456 bytes, 31116288 sectors