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 sudo dd if=/dev/sdb1 of=/tmp/serial bs=1 skip=72 count=8

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blkid -c /dev/null -s UUID -o value /dev/sda1

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#!/bin/dash
IFS=""

# echo with exit for error termination
exho(){
    echo "error: $1"
    exit 1
}

# convert hexidecimal UUID to binary characters
uuid2bin(){
    STBF="$1"
    while [ -n "$STBF" ]; do
        BYTE="${STBF%??}"
        BYTE="${STBF#$BYTE}"
        STBF="${STBF%$BYTE}"
        BYTE="$(printf "%u\n" "0x$BYTE")"
        echo -n "$BYTE" | awk '{printf("%c",$0)}'
    done
    return 0
}

# usage help
if [ $# != 2 ]; then
    echo "$0 <UUID> <device>"
    exit 1
fi

# test the input UUID for validity
UUID_NEW="$(echo -n "$1" | tr [a-f] [A-F])"
STBF="${UUID_NEW#[0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F][0-9A-F]}"
if [ -n "$STBF" ]; then
    exho "invalid UUID format"
fi
if [ "$UUID_NEW" = 0000000000000000 ]; then
    exho "UUID cannot be empty"
fi

# get current/old UUID value via system tool
UUID_OLD="$(blkid  -s UUID -o value "$2" 2>/dev/null)"
if [ -z "$UUID_OLD" ]; then
    exho "could not read old UUID using blkid on $2"
fi

# get current/old UUID value via raw read
STBF="$(dd bs=1 skip=72 count=8 if="$2" 2>/dev/null | hexdump -ve '1/1  "%02X"')"
if [ ${#STBF} != 16 ]; then
    exho "could not read old UUID using dd on $2"
fi

# reorder the hex digits since they are reversed
UUID_RAW=""
while [ -n "$STBF" ]; do
    BYTE="${STBF%??}"
    BYTE="${STBF#$BYTE}"
    STBF="${STBF%$BYTE}"
    UUID_RAW="$UUID_RAW$BYTE"
done

# matching UUIDs confirm NTFS structure
if [ "X$UUID_RAW" != "X$UUID_OLD" ]; then
    exho "$2 invalid NTFS device"
fi

# write UUID to device
if ! uuid2bin "$UUID_NEW" | dd bs=1 seek=72 count=8 of="$2" 2>/dev/null && sync; then
    exho "could not write UUID to $2"
fi

# verify UUID
UUID_RAW="$(blkid  -s UUID -o value "$2" 2>/dev/null)"
if [ "X$UUID_RAW" != "X$UUID_NEW" ]; then
    exho "verification of new UUID failed"
fi

# status information
echo "DEVICE:\t\t$2"
echo "OLD UUID:\t$UUID_OLD"
echo "NEW UUID:\t$UUID_NEW"

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sudo ./uuid_n2 524ED7D84ED7B349 /dev/sdb1

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sudo ./uuid_n2 943B7DE48D7DE425 /dev/sdb1

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sudo ./uuid_n2 943B7DE48D7DE425 /dev/sdb1
DEVICE: /dev/sdb1
OLD UUID: 524ED7D84ED7B349
NEW UUID: 943B7DE48D7DE425

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sudo update-grub

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gksudo gedit /etc/default/grub