Ok, I found it by myself after trying a little bit with disktools. Looking at fstab, I compared two hdd-s, i.e /dev/sdb1 and /dev/sdc.
I saw where the fault was ....! It was simple afterwards, it must be /dev/sdc1. This is all.
Anyway, thank you for helping me, saying that in the biginning what I wrote, wasn't sufficient!