diff --git a/src/Core/System/PBXInstaller.php b/src/Core/System/PBXInstaller.php
index 8ba1c9db2..62a21582e 100644
--- a/src/Core/System/PBXInstaller.php
+++ b/src/Core/System/PBXInstaller.php
@@ -269,9 +269,10 @@ private function copyConfiguration():void
         echo Util::translate("Copying configuration...").PHP_EOL;
         Util::mwMkdir('/mnttmp');
 
-        $confPartitionName = Storage::getDevPartName("/dev/$this->target_disk", '3');
+        echo "Target disk: $this->target_disk ...".PHP_EOL;
+        $confPartitionName = Storage::getDevPartName($this->target_disk, '3');
         // Mount the disk with settings.
-        $mount = Util::which('mount');
+        $mount  = Util::which('mount');
         $umount = Util::which('umount');
         $resUMount = Processes::mwExec("$umount $confPartitionName");
         echo "Umount $confPartitionName: $resUMount ...".PHP_EOL;
diff --git a/src/Core/System/Storage.php b/src/Core/System/Storage.php
index fd39992d9..1033704c0 100644
--- a/src/Core/System/Storage.php
+++ b/src/Core/System/Storage.php
@@ -654,12 +654,10 @@ public static function getDevPartName(string $dev, string $part): string
         $grepPath = Util::which('grep');
         $sortPath = Util::which('sort');
 
-        $command = "{$lsBlkPath} -r | {$grepPath} ' part' | {$sortPath} -u | {$cutPath} -d ' ' -f 1 | {$grepPath} \"" . basename(
-                $dev
-            ) . "\" | {$grepPath} \"{$part}\$\"";
+        $command = "$lsBlkPath -r -p | $grepPath ' part' | $sortPath -u | $cutPath -d ' ' -f 1 | $grepPath '" . basename($dev) . "' | $grepPath \"$part\$\"";
         Processes::mwExec($command, $out);
         $devName = trim(implode('', $out));
-        return '/dev/'.trim($devName);
+        return trim($devName);
     }
 
     /**