If you're currently in MTP mode, then you may want to try MSC mode. First format the player to erase the songs with no tags. Do this by going to the Sync tab in WMP, then click the "format storage media" button all the way to the right.
Switch the player to MSC mode, then transfer the songs to the player again.
If it still doesn't work, you may need the newest firmware update, which is 2.2.5. Send an e-mail to ProductSupport@sandisk.com and ask for the m260 firmware update.
I had a bunch of mp3 in my computer, which had no album, artist or song information. Using WMP I was able to retrieve album, artist and song names and all this information is now in my WMP library. Two issues:
1. How do I get this information from WMP into the original folders where I had the mp3s stored before I searched for the info?
2. When I copy to my device (Sandisk m260) the player displays unknow artist, aunknown album, the only thing that gets transferred is the track number. I have installed the firmware update, I have made sure to check the appropriate boxes in WMP under "Tools" "Options" "Rip music" "File Name"
Please can somebody help me?