fastest modify collection list<t>

what i'd avoid:

managementclass m = new managementclass("win32_logicaldisk");

managementobjectcollection managementobjects = m.getinstances();

list<managementobject> managementlist = new list<managementobject>();

foreach(managementobject m managementobjects){

    managementlist.add(m);

}

isn't there proceed collection list looks something like:

list<managementobject> managementlist = new list<managementobjec>(collection_array);