[ubuntu] Ubuntu 11.10 recognizes WD My Passport Essential but it doesn't show the files

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http://ubuntuforums.org – Hello Gentleman, I am absolutely new on Ubuntu and linux world, and just installed Ubuntu 11.10 on my desktop computer. Everything works fine: USB ports, USB flashdrives, printer. Everything but my external HD which is a WD My Passport Essential 400 Gb. In fact, Ubuntu OS shows it when I plug on the USB port, it shows that it is partially used (181,5 Gb), but it shows no file! It just appears on Media/Mypassport and nothing inside! And this External HD is perfectly working on my notebook, which is windows xp. I used lsusb and it shows Bus 001 Device 008: ID 1058:0704 Western Digital Tec (Hardware)