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#!/bin/bash -e

IFILE=$1
OFILE=$2

dd if=/dev/zero bs=4M count=1 of=$OFILE 2>/dev/null
dd if=$IFILE of=$OFILE conv=notrunc 2>/dev/null

# 0xffff0000:  fe 3f f0 ea     b       0xffc00000
echo -n -e "\xfe\x3f\xf0\xea" | dd of=$OFILE bs=64K seek=63 conv=notrunc 2>/dev/null