Credit : https://askubuntu.com/questions/586308/error-mounting-dev-sdb1-at-media-on-ubuntu-14-04-lts
Command:
lsblk #this will show which disk block to choose, based on the size of ur external disk, you can figure it out. However, handle it with care, u might end up messing ur other important partitions. I won’t liable for any responsibility.
sudo ntfsfix /dev/sdb1 #in my case, sdb1 was the device.
Hope it helps!
Source
Solution for “Error mounting /dev/sdb1 at /media/” on linux distro