This problem seems to be solved in ubuntu 11.04. Can you try to upgrade to 11.04?
If the problem continues, please post a comment in this bug thread. ** Changed in: ubuntu Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/786776 Title: USB disk writes cause IOWait, freeze system -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs