try to use slider for additional disk in createVM

app/UI/Disk/Pages/DiskDataTable.php

@@ -141,7 +141,7 @@ class DiskDataTable extends DataTable implements ClientArea
                 "bytes"  => $entity->getBytes(),
                 "master" => $entity->isMaster(),
                 // thurdata patch: prevent root disk from being deleted
-                "root"   => $rootDisk,
+//                "root"   => $rootDisk,
                 // thurdata end 
             ];
         }