Examples for transitioning between operating systems are disclosed. An example apparatus includes reserved copy circuitry to copy state data of a first operating system from a first portion of first memory to a second portion of the first memory in response to an operating system toggle event; toggle event circuitry to, in response to a determination that the state data has been copied to the second portion of the first memory, initiate execution of a second operating system, the second operating system loaded from a hibernation file in second memory; and write out circuitry to copy the state data of the first operating system from the second portion of the first memory to the hibernation file while the second operating system is executed on the apparatus.