I have just installed sparky linux.
Using sparky's file manager, shows my internal hard drive partitions in the media folder.
It show be in the /mnt folder instead.
The installer also does not handle booting right.
I had to use boot-repair to fix Sparklinux.
Is a way to handle the install so partitions are in the /mnt folder.
You can store/save all you external partitions manually in the /etc/fstab file so will be mounted where you need:
https://en.wikipedia.org/wiki/Fstab