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I got a WD My Passport 1TB external HD, ubuntu recognize it as a CD but cant mount it. I'm usin a PC AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ × 2, Edubuntu Presice 12.04 64-bit, 500GB HDD, 8GB RAM, graphics: Gallium 0.4 on NV4C

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Please do the following: after the drive has been connected, type dmesg in a terminal window and post the output using – January Sep 21 '12 at 4:30
If the device is recognized by Ubuntu as a CD-ROM, that means that the device is trying to load a (Windows) driver. You may need a USB modeswitch setting for this particular brand/model of USB device. – david6 Sep 21 '12 at 8:40

I got the same device running fine on Ubuntu 12.04 64 bit. You may try to re-partition/format the device with an other file-system (mine is using ext3 /w TrueCrypt).

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