buscando-dados-pendrive.php

<?php

$FileSysObj = new COM('Scripting.FileSystemObject');

foreach ($FileSysObj->Drives as $Drive) {
    $Drive = $FileSysObj->GetDrive($Drive);
    if ($Drive->DriveType!=1) {
        continue;
    }
    $Letter = $Drive->DriveLetter;
    $Files = glob("{$Letter}://*");
    echo "{$Letter}:// <br>";
    var_dump($Files);
}