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I have experienced this issue with almost all versions of ubuntu. It happens with all types of thumb drives. I have faced same issues with all the pc's I have used. At the beginning it seems like data is getting copied with a reasonable speed but after few seconds it slows down, and progress bar even stops intermittently. In comparison to speeds on windows, it is terribly slow.

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up vote 2 down vote accepted

Looks like it could be any one of the following bugs 591174 541937 or 197762

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you can try to use cp and compare the speed sometimes this helps. This bug really annoyes me since Intrepid. – turbo Nov 20 '10 at 14:12

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