Final answer:
Changes made to an image using DISM are saved immediately after the execution and completion of each command. DISM is used for servicing Windows images and changes made are generally irreversible without backups. Each command's effect is instant, highlighting the importance of accuracy in command use.
Step-by-step explanation:
When changes are made to an image using the Deployment Image Servicing and Management (DISM) tool, they are saved immediately after each command is executed and completed successfully. DISM is a command-line tool that is commonly used for servicing and preparing Windows images, including those used for Windows PE, Windows Recovery Environment, and Windows Setup.
When you use DISM to make modifications to an image, whether it is to mount and unmount images, apply updates, drivers, or to change Windows features, the changes take effect as soon as the command is successfully processed. Therefore, it is crucial to ensure that each command used with DISM is correct, as the changes made are often irreversible without the use of backup images or restore points.
For example, if you use DISM to install a new driver into a Windows image, the change is saved instantly after the command is executed without any additional save command. This behavior emphasizes the importance of command accuracy and understanding the implications of each modification you make to an image.