Chown file in external HDD

[0011235813]

Hi, I'm backing up a file created with tiger john chkrootkit, to my external HDD for safekeeping. That way, if the system is compromised and the file is edited or removed, I will still have the file backed up so I can check it with the new report (this is all just hypothetical of course). Trouble is, I can't get the file to change permissions! When I try;

sudo -i

(root@computername:~#)cd /media/My Book/Security

bash: cd: 'My': no such file or directory found

(My Book is the name of the HDD, and Security is the name of the directory it's {the file} is stored under).
or:

cd /media/My-Book/Security

doesn't work either. But when I do:

cd /media
(root@computername:/media#)

it works. Using the command;

ls

I get:

My Book

But I can't go to it! Does anyone know how to do this? Or any alternative (graphical) method? I can just back it up to cryptkeeper folder, but still.