A hard disk, CD-ROM or floppy disk that contains part or all of the operating system or other control program. See bootable disk, system file and system folder.
"system disk." YourDictionary, n.d. Web. 13 July 2018. <http://www.yourdictionary.com/system-disk>.
system disk. (n.d.). Retrieved July 13th, 2018, from http://www.yourdictionary.com/system-disk