[SOLVED]dd not writing anything to disk with sync being used.

I just want to post here to try and figure out what was going on here, I was trying to use dd to create a bootable arch usb. I've done similar things a half dozen times so I didn't think much of it. I unmounted the usb drive I wanted with
umount /dev/sdb1
then ran the dd command
sudo dd bs=4M if=archlinux-2013.12.01-dual.iso of=/dev/sbd && sync
130+1 records in
130+1 records out
547356672 bytes (547 MB) copied, 0.188795 s, 2.9 GB/s
now as you can see from the time it took (0.188795s !) it didn't actually write any files. So, after I spent far too long messing about, I decided dd was causing the problem and so used dcfldd
sudo dcfldd bs=4M if=archlinux-2013.12.01-dual.iso of=/dev/sdb && sync
which ended up solving the problem. can anyone explain why this was happening in the first place?
Oh and when I first tried it I got this due to using lowercase m (in case that's relevant):
dd bs=4m if=archlinux-2013.12.01-dual.iso of=/dev/sbd
dd: invalid number ‘4m’
Last edited by crashandburn4 (2013-12-04 20:21:11)

Your failed attempts mention sbd and your successful attempt mentions sdb. If that's not just a typo then it'd certainly explain the problem.

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[SOLVED]dd not writing anything to disk with sync being used.

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