Awesome! Thanks for your work developing such cool software. :-)
Here's the output of the above command:
user@debian:~$ sudo lsblk -o name,maj:min,rm,size,ro,type,fstype,label,mountpoint
NAME MAJ:MIN RM SIZE RO TYPE FSTYPE LABEL MOUNTPOINT
loop0 7:0 0 335.3M 1 loop squashfs /usr/lib/live/mount/rootfs/filesystem.squashfs
sda 8:0 1 1.9G 0 disk iso9660 GParted-live
|-sda1 8:1 1 390M 0 part iso9660 GParted-live /usr/lib/live/mount/medium
sdb 8:16 1 972M 0 disk iso9660 GParted-live
|-sdb1 8:17 1 970M 0 part vfat 1GB-SD-CARD /tmp/usb
mmcblk0 179:0 0 58.2G 0 disk
|-mmcblk0p1 179:1 0 16M 0 part
|-mmcblk0p2 179:2 0 56.9G 0 part ntfs Old OS
|-mmcblk0p3 179:3 0 1G 0 part ntfs RECOVERY
nvme0n1 259:0 0 232.9G 0 disk
|-nvme0n1p1 259:6 0 2G 0 part vfat
|-nvme0n1p2 259:7 0 128M 0 part
|-nvme0n1p3 259:8 0 120G 0 part ntfs Win10 NVMe
|-nvme0n1p4 259:9 0 105.8G 0 part ext4 Arch
|-nvme0n1p5 259:10 0 5G 0 part swap swap
mmcblk0boot0 179:256 0 4M 1 disk
mmcblk0boot1 179:512 0 4M 1 disk
user@debian:~$
So mmcblk0 is that disk that isn't detected.
Let me know you need any further details.
Cheers :-)