System starting method and apparatus, electronic device and storage medium

The invention provides a system starting method and apparatus, an electronic device and a storage medium. The method comprises the steps of, if it is detected that a first storage device cannot be normally written with data or a preset instruction of a user is received, establishing a mapping relation between an address space of the first storage device and an address space of a second storage device; receiving a read-write request sent to the first storage device, wherein the read-write request is used for obtaining or storing data required when a system is started; if the read-write requestis a write request for the first storage device, according to a first address of the first storage device in the write request and the mapping relation, writing the data into a second address in the second storage device; if the read-write request is a read request for the first storage device, judging whether a fourth address corresponding to a third address in the read request is written with the data or not, and if the