Nothing to do with casper, I'm highly suspecting that the issue is simply the USB driver or the kernel. Note that USB disks can easily range from 2MB/s to 40MB/s, so the brand does matter a lot.
** Changed in: casper (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1048000 Title: Precise: Very slow boot / Unity 3d does not start on some USB drives To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1048000/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs