HD files upscale more cleanly to modern 4K monitors than older formats. The Role of the "Uploader Tag" (dioguitar23)
This is a date-coded serial number. It typically represents the release date (September 24, 2011) followed by the scene or part number (01). This format is crucial for chronological database management. 10musume 092411 01 hd dioguitar23 better
If you are trying to archive or locate specific media using these keywords, you are essentially looking for a HD files upscale more cleanly to modern 4K