unit assigns folder number. The user can not assign folder numbers. is not possible to check folders that do not include MP3/WMA/AAC files. (These folders will be skipped without displaying the folder number.) files in up to 8 tiers of folders can be played back. However, there is a delay in the start of playback on discs with numerous tiers. For this reason we recommend creating discs with no more than 2 tiers. is possible to play back up to 192 folders on one disc.