The present invention discloses methods for managing files according to application. A method for accessing files in a digital storage device, the method including the steps of: providing an application having an application identity; and adjusting a storage mode of a file according to the application identity upon the application accessing the file. Preferably, the step of providing includes providing a PID that is an indicator of the application identity. Preferably, the step of adjusting includes adjusting the storage mode according to a storage command associated with an application scenario of the application. Preferably, the step of adjusting is performed using an SAT. Preferably, the step of adjusting is performed using an AST.