A charged particle beam apparatus is provided with a parameter adjustment practice function for allowing any user to easily learn manual focus adjustment and stigma adjustment. An access program module, connected to at least one file system, intercepts a data request for accessing a plaintext file with information stored physically and consecutively on a hard disk and having a pre-determined order and length expected by a program that sends the data request, wherein the plaintext file includes a plaintext record having a key field and a plaintext data field. The logic cell includes a first sourcedrain region and a second sourcedrain region separated by a channel region in a substrate.