# Identify Disk
sudo lsblk -f

# Mount Main FS
sudo mkdir -p /mnt/mychroot
sudo mount -t ext4 /dev/sdb1 /mnt/mychroot

# Bind System Dirs
sudo mount --bind /dev /mnt/mychroot/dev
sudo mount --bind /dev/pts /mnt/mychroot/dev/pts
sudo mount --bind /proc /mnt/mychroot/proc
sudo mount --bind /sys /mnt/mychroot/sys
sudo mount -t tmpfs tmpfs /mnt/mychroot/run

# Chroot In
sudo cp /etc/resolv.conf /mnt/mychroot/etc/
sudo chroot /mnt/mychroot

# ... Do your work ...

# Clean Up
#exit
#sudo umount /mnt/mychroot/run
#sudo umount /mnt/mychroot/sys
#sudo umount /mnt/mychroot/proc
#sudo umount /mnt/mychroot/dev/pts
#sudo umount /mnt/mychroot/dev
#sudo umount /mnt/mychroot