this.managerRoot.mkdir();
this.managerRoot.mkdirs();
	public FileManager(File base, String lockMode) {		this.base = base;		this.lockMode = lockMode;		this.managerRoot = new File(base, MANAGER_FOLDER);		this.managerRoot.mkdir();		this.tableFile = new File(managerRoot, TABLE_FILE);		this.lockFile = new File(managerRoot, LOCK_FILE);	}