Now perhaps you would like to give us some info such as make model of the mp3 player, how you transfer files, software used for transferring, etc. and some actual useful info. Most of us can't afford crystal balls.
Thanks for being so frank. The mp3 player has no markings but is a flash disk type. I was using drag & drop from a music file (mp3s) to removable disk directly. It worked perfectly on another mp3 player.
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