How to download google repo source to the mobile hard disk? Novice neighborhoods.

            


I ubuntu dual system allocated space is only 20G, the source has a 10G, want to move down to the hard drive, I am more naive to WORKING_DIRECTORY handcuffed directly to mobile hard disk directory, the emergence of this:

ido @ Xine: / media / Portable WJ / WORKING_DIRECTORY $ repo sync
fatal: unable to start / media / Portable WJ / WORKING_DIRECTORY / .repo / repo / main.py
fatal: [Errno 13] Permission denied

This amount can be how do enforce it?
I tried chmod a + x / media / Portable WJ /
Too. . .
I find no way out. Help everyone - -
Reply:
Landlord did not know that there was no law there is a solution?