Bad track thats not really bad

You have songs that may be protected or the wrong format for your device.
delete the bad song and download another copy from a different source and try it.
This is not to uncommon due to different file formats and protection in the song files
When you rip songs from another device often some won't load or play in another device
especially if they are paid for songs.

Your DB might be corrupt. Folow the delete procedure one more time:
Delete Music Files
1) Connect your Sansa to the computer.
2) Select Open device to view files using Windows Explorer on initial
connection.
3) Select the place where you want to delete music files from
4) Highlight and delete the music file/s or folder from My Computer\Sansa
e200\...\MUSIC folder. (You can also select from a variety of music
software programs to transfer/synchronize your files).

If that fails, go ahead and update the firmware - it will delete everything, and allow you to start over from scratch among other things.

-Tha Mp3 Doctor

The database has been corrupted, click HERE for how to properly format and reload firmware if need be...

There are several possibilities here. Right click one of the songs that is no longer showing, and click "Properties", and then click the "License" or "Digital Rights" tab. Look at the details of the license - does it say that it is only good for such and such a date? If you were using a trial version of a music service, has that music service's subscription now expired? If the license is expired, the songs will go bad. Only soultion, if this is the case, is to renew your music service subscription.

Try updating the firmware on the player by going to Sansa's website.

After that, reformat the player in Windows Media Player and reload the songs.

Good luck.

Tha Mp3 Doctor

same thing happened to me it still doesn't work and mine is supposed to hold 500 it only holds 150

Not 100% sure but you probably need to rip your music to an MP3 format before you sync it to your Sansa. If you loaded it as a .wma format this would appear as you are seeing it. WinXP Media Player 11 is a simple way of doing this. Some MP3 players don't support all the formats but will llet you load them

well i had same problem try this
1.take all songs to computer (and pictures ,movies)
2.make sure your computer dont shows hidden(needed files) files.. if you are using xp or vista do this controll panel/folder options
3. delete all music,pictures,movies on your mp3/mp4 ( dont delete any thing other!! )
4.pull the music back to it
/it worked for me well well hopes it works

You have a corrupt file - bad file...

Corrupt files for sansa -

Plug your player in, in MSC mode.

Right-click on it.

Click "properties"

Click "tools"

Click "Error Checking"

Check both the boxes on the error checking window that pops up, and click start.

After it finishes, check your player to make sure your player is normal.

If that don't work then format = http://www.sandisk.com/Retail/Default.as...

I would try formatting the drive/player. Why can't you delete the bad file?

what you really have to do is: 1: Double click my computer 2:Double click Sansa e250 drive 3: Right click on the icon that looks like a disk drive and click format BE SURE TO HAVE BACKUP OF SONGS BEFORE YOU FORMAT!!!