I'd like to create USB stick having both: a) Ubuntu 16.04 installer, b) storage partition. So I can boot a computer with it, install or just start Ubuntu and be able to copy data from computer drives to the storage part.
"Startup Disc Creator" makes two partitions: first ISO Joliet about 1.5 GB, second FAT32 EFI 25MB, and leaves rest as unused. I tried to create partition there but both Discs and GParted applications complain about sector size error (drive descriptor shows 2048B while Linux says 512B).
I found similar question: "Creating a startup disk on a partition of a USB drive", but a workaround making two primary FAT32 partitions does not work, "Startup Disc Creator" always uses whole drive, writing first 1.5 GB of pendrive and leaves rest unusable (126 GB).
Tried "Install GRUB2 on USB from Ubuntu Linux" too (http://www.pendrivelinux.com/install-grub2-on-usb-from-ubuntu-linux/), but a command "grub-install --force --no-floppy --boot-directory=/mnt/USB/boot /dev/sdd" returns "input-output error".
Is there any other way to make one USB stick for both purposes?