A method for operating at least one first computer entity with an operating system of a second computer entity includes: detecting and registering a set of initialization data and driver files stored in the first entity computer entity, copying the driver files into the files of the second operating system, adapting each of the files, and reading and adapting the initialization data, for the second operating system, injecting the initialization data into initialization structures of the second operating system, making the media containing the second operating system available to the first computer, initializing the first computer entity with the second operating system, the initialization structures being used by the second operating system to initialize and operate the device controller of the at least one bootable device, and the device controller controlling access to the media that stores computer files of the second operating system to follow the initialization of the first computer entity with the second operating system.