Testing method and testing device

An embodiment of the invention provides a testing method and a testing device. The testing method includes that first data to be tested are written to a second storage device, and the data to be tested are in a first storage device; and in a process of testing the first storage device, when users want to access the first data in the first storage device, first access is executed on the first data written to the second storage device. By means of the testing method and the testing device, accessed data are not damaged by testing, therefore a problem of errors caused by the damaged data in the prior art is solved.