Hi, BearShare "synchronized" my Sony

SOURCE: Sony Walkman NWZ-S615F problem detecting and syncronizing

I had the same problem. One day my Mp3 started acting weird and said it was not recognizing the files and that i needed to re download them. Try plugging it up to your computer while its charging and hit the power off. Then reset your mp3 with the button at the bottom and it should recognize it.

SOURCE: Transferring from CD to MP3 player

which program are you using?

SOURCE: Cant remove empty folders tells me their write protected!

connect the device to the computer and format the device once
then add data that you want

SOURCE: HELP ME PLEASE with my "sony walkman NWZ-B105F MP3 PLAYER."

make sure your downloading it to the right folder on the mp3 player its usualy the music folder or you can try and use windows media player here are some instructions for that option.
--**Windows Media Player**--
If you have a large playlist to transfer, you may prefer to do it from your media player, such as Windows Media Player. Once your MP3 player is connected to the computer, open Windows Media Player. Click on the "Sync Music" tab. Drag songs that you want from your Windows Media Library over to the "Sync Music" column to create a playlist. Click the "Begin Sync" tab at the bottom once you have all of the songs on your playlist. This action will sync all of the songs to your MP3 player with one click. Disconnect your device once songs have been transferred by clicking on the "Safely Remove Hardware" icon in the bottom-right side of the desktop tray.

SOURCE: mp3 reformat

if you have the initial executing files that were on your mp3 when you bye,

Format your Mp3 on PC by FAT32 format and copy those on your Mp3 player folder