Ubuntu :: Write And Read From A Ext3 8GB Usb?

I have a netbook with Ubuntu 10.10 installed in it,and a Pc with also ubuntu 10.10 in it , but x86_64.

I want to copy some iso files and data from my user home directory on the netbook , to the user home directory of the other pc , using a 8 GB usb formated in ext3 with gparted in my pc.

One iso is a windows 7 one to burn then with K3b , as i need to have windows installed in that box. Also of another iso that i have to burn too (windows 7 recovery disk) , and 3 anti-virus trials for windows.

As the usb is owned by the root (or more properly the mounting point,no?), and i can't use my user to copy data to it i usually do :

Usually , what i use is "sudo nautilus" then go to the place where is the data , copy it , and paste it then in the usb. Then in the other pc i do a chgrp and chown to the iso or file.

But , perhaps this is not the better approach. I have investigated a bit , and i think that i have found a better way , but i have some dudes.

The method is change the owner,group and permissions of the mounting point:

Code:
cd /media
ls
umount /dev/sdb1
sudo mkdir usb

[Code].....

If i do this steps in both computers, with each user,in the netbook i can copy the iso to the usb (as fox can write to the mount point of the usb ), but can the other user in the pc 'mulder' read the iso , so be copied to /home/mulder, and then be able to burn it in k3b with success ?

I suppose that having 766 , it should be able to read it , but would have the own of the file ?

How important is not to only be able to read it , but also own it ?

I suppose if the user ID is the same , wouldn't be any problem ,as each ubuntu would supose that the file is owned by their user.

Perhaps the user name change,but if the ID is the same , the user is the same for ubuntu , not any different, no ?