Hi, the more experiments I do, the more problems I see. I found similar problems on two completely distinct machines (both with Ubuntu 9.10 and 2.6.31 kernel) with an (encrypted with cryptsetup) 16GB USB pendrive. Both problems seem to be similar so it would prove that it is not caused by hardware problems. I've just attached a dmesg output to the bug report page. See also ubuntu bug 183839 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/183839, which describes exactly that problem, but claims to be fixed. I just tried to compile a 2.6.32 plain kernel from kernel.org with ubuntu's config file, but it could not boot and complained that the ATA devices were not ready, and I am too busy right now to spend the whole weekend doing tests. But somewhere (maybe in a patch applied to the kernel by the ubuntu team) is something wrong with external usb mass storage. regards Hadmut -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html