try to disable delete button on root disk

app/UI/Disk/Pages/DiskDataTable.php

@@ -127,7 +127,7 @@ class DiskDataTable extends DataTable implements ClientArea
             if ($entity->getName() == 'disk-0') {
                 $rootDisk = true;
             } else {
-                unset($rootDisk);
+                $rootDisk = false;
             }
             $data[] = [
                 "id"     => $entity->getId(),