private synchronized String getNextStorageName() {
		String storageName = StringUtilities.pad(Long.toHexString(nextFileIndexID++), '0', 8);
		getStorageDir(storageName); // ensure that storage sub-directory exists
		return storageName;
	}
Assign next available storage name
@return storage name (8 hex digits)
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/IndexedLocalFileSystem.java