I followed the instruction from your site: https://www.modmypi.com/blog/how-to-mou ... pi-raspian
To connect my ntfs-USB-HDD to my RaspberryPi 2 B with Raspbian. I cannot find how to write/read files to/from this HDD? (for instance: if I download a PDF I would like to save it on my disk). What is a real check to be sure that it is mounted (there is an instruction at the end, but the confirmation of the mkdir is no there)? With what linux commands I realy can approach the HDD?