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Assuming that this is the standard Pioneer unit, here are the rules from the manual:
This unit assigns folder number. The user can not assign folder numbers.
MP3/WMA/AAC files in the USB portable audio player/USB memory are played
in the same order as they were copied to the USB portable audio player/USB
memory.
To specify the order in which files in the USB portable audio player/USB
memory are played, we recommend the following method.
1. Using a personal computer, add a number indicating the playback order in
front of the file name, e.g. [001xxx.mp3] or [099yyy.wma].
2. Put the files into a folder.
3. Copy the folder to the USB portable audio player/USB memory.
Depending on the computer environment, it may not be possible to specify the
order by this method. It is not possible to check folders that do not include
MP3/WMA/AAC files. (These folders will be skipped without displaying
the folder number.)
MP3/WMA/AAC files in up to 8 tiers of folders can be played back. However,
there is a delay in the start of playback on discs and USB portable audio
player/USB memory with numerous tiers. For this reason we recommend
creating discs with no more than 2 tiers.
It is possible to play back up to 192 folders on one
disc.
It is possible to play back up to 255 folders on one USB portable audio player/
USB memory.
You should check your USB drive folder structure to make sure that it complies with these requirements.
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