Simple DD like tool made in PHP, just change the disk you want to read and dump

dd.php

<?php

echo "Disk size: ".disk_total_space("D:").PHP_EOL;


$disk = fopen('\\\\.\\D:', 'rb+'); //escaping the escape
$chunk_size = 4096;

while (!feof($disk)) {
	$bin_data = fread($disk, 4096);
	file_put_contents("dump.bin", $bin_data, FILE_APPEND);

}

fclose($disk);

echo PHP_EOL."100% completed. Done.";