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I think you need to include block size, bs=512 to remove partition table and bs=446 to remove only MBR. It then like dd if=/dev/zero of=/dev/sdf1 bs=446 count=1. I am not so sure. Someone might correct this.
OK-that didn't work either-
So far I've deleted/formatted the USB and did dd if=/dev/zero of=/dev/sdf1 bs=446 count 1
I also tried /dev/sdf and /dev/null.
Nothing works-when I try to boot off the USB grub is still there!
So-how do I get Grub off my usb mbr?
I have always relied on Ranish Part image for those pesky hard to get rid of partitions..I do not know if it will work on USB though..Maybe someone else has used it there can respond..
Thats all i can think of now..
Edit Later: I just did a test on two of my computers(one older and one newer) and Ranish did not see the USB drive..Thus I am sorry It does not seem to work here..