systemdisk
nounUK /ˈsɪstəm dɪsk/
US /ˈsɪstəm dɪsk/
A system disk is the main computer disk that holds the programs needed to start the computer.
The technician reinstalled the operating system on the system disk.
OTHER MEANINGS
2. A disk containing the operating system files for a computer.
Make sure the system disk is not full before installing updates.
3. In some contexts, the disk designated as the primary storage device in a computer system.
The server's system disk failed, so they replaced it with a solid-state drive.
4. A removable disk used to boot or repair a computer.
He created a system disk to recover the machine after the crash.