■■■ 효과음 ■■■ 인트로로딩mikepro-blade intro c# https://freesound.org/people/mikepro/sounds/438921/ 하드디스크스핀업exacom-old hard drive spin up and spin down https://freesound.org/people/Exacom/sounds/554672/ 스핀업cydon-future car_002 or spaceship https://freesound.org/people/cydon/sounds/268867/