I use sudo dd if=file.iso of=/dev/sdc bs=1M && sync to copy yocto iso images to a flash drive. This usually works all the time without issue. Today it stopped working correctly it usually takes a few minutes but it completed in a few seconds. There were no errors messages, nothing in dmesg, nmon didn't show any disk activity with /dev/sdc.

Plugging the flash drive in and out a few times didn't fix the issue. I had to reboot and then it started working correctly.

I don't understand what happened or why. Is there a way to fix the problem without reboot?

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    Next time it fails, please add the result of ls -l /dev/sdc to your question. – roaima Jan 24 at 14:18
  • It's going to be hard to tell if there is a problem if there is no error messages, or if it isn't reproducable... (Maybe dd was tired... :p) – jayooin Jan 24 at 14:59
  • @jayooin It was very confusing. Nothing seemed to work or cause an error. I tried fdisk, parted, whatever I could think of that should have an effect to even erase the existing data. I assumed that if there was error it would should up dmesg. One reason I asked is because I don't know what else I should have checked. – Fred Jan 24 at 18:04
  • If you plug it in a second and third time, it might be named /dev/sdd, /dev/sde, etc. Run lsblk next time this happens and show us the results. – Mark Plotnick Jan 25 at 1:53
  • @MarkPlotnick I've probably done this at least 50 times over the last 3 months working with yocto images. It's never been anything other than /dev/sdc. I did run lsblk and as usual there was /dev/sda, /dev/sdb/, and /dev/sdc. When the USB stick is removed then lsblk only shows the sda and sdb devices, no ghost devices. It was only a problem today and hasn't happened since rebooting the computer. – Fred Jan 25 at 3:54

I've had this before. Happened after performing a system update, the kernel was upgraded. Did you perform an update?

  • I'm using Ubuntu 14.04 LTS. There was some sort of update but I'm not sure what it was. – Fred Jan 24 at 17:49

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