dd linux command in shell

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http://ubuntuforums.org – I'm using the dd command to create a bootable usb from iso file: sudo dd if=~/Desktop/ubuntu.iso of=/dev/sdx bs=1M After pressing enter it momentarily exits and gives me: 915+0 records in 915+0 records out 959447040 bytes (959 MB) copied, 0.539375 s, 1.8 GB/s So it's like running in background because I can see that the flash drive is working. Eventually it will stop copying and I can remove the drive successfully but the question is why doesn't dd command wait for copying to finish. Why does it run in background. And how can I make it wait? (Hardware)