Answer:
Rescue disk
Step-by-step explanation:
The computer system is an electronic device with a circuitry of interconnected hardware devices like processors, input devices, output devices and storage devices. It's hardware is controlled by a kernel software provided by a system software called the operating system.
The operating system is stored in the storage device (HDD or SSD) and is loaded to run on the system during the boot process.
A common practice is to create a restore point in a partition of the primary storage or in an external storage disk, when a software from an untrusted vendor is to be installed. This partition or storage is called a rescue disk.
A rescue disk is used to recover the normal operation of the computer system software by re-installing the operating system restore point.