Any SD card over 2 GB will be a problem. Off brand stuff seems to also be a problem. Check the Wiki. There was also a thread about a year ago on what worked and what did not work. All San Disk, Lexor, and Sony brand stuff seems to work fine.
The Sony has a flat file system. Even if you segment your music into folders it will play the music in alphabetical order based on the filename. No skips, no playlists, no random selection.
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