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when i try to transfer data to a pen usb in ubuntu 12.04, the system give me error. The pen is formated in fat32. sorry the english and thank you for any help.

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Without telling us what the error was it is hard to help you. Try it again; write down the error; open a terminal, type dmesg and write down the last dozen or so lines. – January Sep 3 '12 at 10:34

The size of the file could be the issue: FAT32 has limits on the maximum size of a file (4GB).

If this is the case, you may want to reformat the USB drive (make a backup copy of the current content before doing that!).

Here you can find instructions on how to format a drive:

How to format a USB or external drive?

You could choose NTFS (good choice if you wish to share files with other operating systems

or EXT2 (if your USB drive id to be used for Linux only

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