sˌʌm tˈuːlz kɹiːˈeɪt ðɪs stɹˈʌktʃɚɹ ɔnðə hˈɑːɹd dɹˈaɪv fˈɪzɪkəl stɹˈʌktʃɚ, wˌaɪl ˈʌðɚ tˈuːlz kɹiːˈeɪt ɐ vˈɜːtʃuːəl stɹˈʌktʃɚ ɪɾ ɛɡzˈɪsts ˈoʊnli wɪðˌɪn ðə tˈuːl.
Some tools create this structure on the hard drive (physical structure), while other tools create a virtual structure (it exists only within the tool).