Ok. Here it is. I limited access to my external hard disk's partition/volume on Mac os X simply by changing permissions in Get Info window. But now the hard disk icon has disappeard and wont mount. Have tried different kind of soft to mount, but no luck. Then there is the utility called Terminal, with some very basic knowlegde of (closer to 0) UNIX I could change the permissions of the volume to make it come back, if this is the case. If anyone could show some light, either to run something on Terminal or to use some other type of soft, that either lets me to change permissions back to rwx or to mount the volume so I can do it in Get Info window.
When I open Disk Utility, I can see the volume icon, but the soft does not mount it.
I hope I explained myself clearly. Huge THanx in advance for advise.

FOUND ANSWER TO IT, AND POST IT HERE IN CASE SOMEONE HAS SIMILAR PROBLEM. ADVISE FOR NUBIES (LIKE ME) - ITS BETTER IF YOU DONT SET "NO ACCESS" TO YOUR VOLUMES (ON MAC OSX, GET INFO WINDOW).

Here is copy of Terminal log:
NOTE! Dont forget to replace given volume name with your volume name! Also if your volume doesnt have space in its name, you can remove quotation marks!

Red is a command line and green is outcome


meelismalgand:~ meelismalgand$ sudo chmod -R u+wX "/Volumes/HDD 2"
Password:
meelismalgand:~ meelismalgand$
meelismalgand:~ meelismalgand$ ls -l /Volumes
total 8
lrwxr-xr-x 1 root admin 1 Aug 30 16:50 HDD 1 -> /
d-wxr-xr-x 33 meelisma meelisma 1224 Aug 12 11:35 HDD 2
d---r-xr-x 33 meelisma meelisma 1224 Aug 12 11:35 HDD 2 1
meelismalgand:~ meelismalgand$