On 1/23/15 2:09 PM, Colin Ian King wrote: > On 23/01/15 18:29, Rodney Dawes wrote: >> On Thu, 2015-01-22 at 16:22 +0100, Stefan Bader wrote: >>> On 22.01.2015 15:23, Rodney Dawes wrote: >>>> I've been trying to create one recently, under 14.04 running the >>>> lts-utopic kernel. It seems the old problem of flushing is back. When I >>>> run "dd if=ubuntu-14.04.1-amd64.iso of=/dev/sdg bs=4096" it exits almost >>>> immediately, and then the LED on the USB spends the next several minutes >>> That is the expected behaviour with that incantation. If you added a >>> "oflag=sync" dd should return only after write has finished. In your case >>> you >>> use cached writes. >> Even with oflag=sync, I still get an unbootable USB stick. Now it is >> showing the following messages when trying to boot: > I'll be tempted to write all zeros to it and see if you get all zeros > when you read it back. Sounds like the media is unreliable. > > e.g > > dd if=/dev/zero of=/dev/sdg oflag=sync > sum /dev/sdg > > Or the kernel is misreading the device and hence, writing to it incorrectly and bailing on odd error that isn't in the error handling routines.
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