private File getStorageDir(String storageName) {
		// storage dir uses 3rd and 2nd hex digits to form name
		int len = storageName.length(); // should be 8
		File dir = new File(root, storageName.substring(len - 3, len - 1));
		if (!dir.exists()) {
			dir.mkdir();
		}
		return dir;
	}
Get storage directory corresponding to the specified storageName
@param storageName Item storage name (8 hex digits)
@return
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/IndexedLocalFileSystem.java