final File getDataDir() {
		synchronized (fileSystem) {
			// Use hidden DB directory
			return new File(propertyFile.getFolder(),
				LocalFileSystem.HIDDEN_DIR_PREFIX +
					LocalFileSystem.escapeHiddenDirPrefixChars(propertyFile.getStorageName()) +
					DATA_DIR_EXTENSION);
		}
	}
Returns hidden data directory.
NOTE: Even if a data directory is not required this method will still return one to 
allow removal of an unknown item type that may or may not use it.
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/LocalFolderItem.java