A method of testing memory devices includes issuing a command to a Flash memory device, simultaneously monitoring at least one data bit of each Flash memory device for a ready indication, and then verifying the command was performed successfully in each Flash memory device. One end of each semiconductor die has attached thereto a respective printed circuit board. The client accesses the network storage system through one or more storage ports. The second conductive type side electrode is disposed on the light emitting area. The display device compensates for the varying distances of the surface onto to which the image is projected from the projectionobjective lens to display a clear, non-distorted image. And an end of the metal pattern is fixedly attached to a lead pin for signaling, attached to a stem, for electrical continuity, so as to be in a posture horizontal with each other.