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So in computers, Operating System is installed and stored on the hard disk. As hard disk is a non volatile memory, OS does not lose on the turn off.
How can I tell where my operating system is installed?
Find operating system info in Windows 10
- Select the Start button > Settings > System > About . Open About settings.
- Under Device specifications > System type, see if you’re running a 32-bit or 64-bit version of Windows.
- Under Windows specifications, check which edition and version of Windows your device is running.
Where does the OS resides in the computer?
The Operating System is stored on the Hard Disk, but on boot, the BIOS will start the Operating System, which is loaded into RAM, and from that point on, the OS is accessed while it is located in your RAM.