Multi-mode computer systems and operating methods thereof. The computer system comprises a storage device and a boot program. The storage device includes a single disk partition comprising a first operating system corresponding to PC mode, and a second OS image and a file system image corresponding to media mode. If an instruction for PC mode is received, the boot program loads the first OS on the computer system, enabling the computer system to operate in PC mode. If an instruction for media mode is received, the boot program starts the computer system according to the second OS image and the file system image, enabling the computer system to operate in media mode.