It doesn´t recognized the music files

Sorry, it doesn't work that way. You can use a separate card reader to put files onto the microSD card. When the card is installed into the Sansa, the Sansa will see the additional music.

the extra memory is considered a seperate drive and is recognized by your computer. Try moving the files you have from the normal internal memory to your backup drive so that you can download to internal again. (Via your computer and dragging and dropping)

1. Plug the sansa into your PC. If Windows does not recognize the clip, unplug it, turn it off, and then put the clip in "hold" mode by placing the on/off switch into the hold position. Hold down the middle button on the Clip while you plug the clip back into your PC. It should recognize it.

2. From "My Computer", find the sansa icon and choose format. Note: this will delete all your music files on the device...

3. Download the firmware updater for the sansa
http://www.sandisk.com/Retail/Default.aspx?CatID=1376

4. Follow the instructions to update your firmware.

5. If you need additional assistance try calling Sandisk's tech support:
1-866-SANDISK (726-3475)
7 days a week:
4am. - 10pm. Pacific Standard Time
7am - 1am Eastern Standard Time

I hope that helps
Please rate accordingly
Thank you
Computerrep

well, try with another cable it can be that but im not so sure ....
if that dont works i guess you can go back to the store with it

You need to first update your firmware with a windows based computer (one update at a time in order). This will solve a ton of issues. Finally change the "USB Mode" to "MSC" with in the settings menu and you can enjoy your player

I have had this problem for some time now and finally got through to tech support for Sansa and now have the solution:Worked for both 230 and 240.
Take out the battery in the Sansa player; Put on lock on back side of Sansa player; Connect Sansa to the computer, Once computer recognizes device cancel out of that media program; Go to my computer on desk top; Right click on recognized Sansa device; Click format; Click ok to delete files.

I would stop using the program that you are using. Instead, and this is what I like to do, when you connect your mp3 player to your computer, and you open "My Computer," your mp3 player should pop up like a hard drive. Open it, and drag - and - drop your files from your music folder. It's a lot faster to do this.

Plug it into the computer (the cord you would use to charge it and transfer files), and hold down the power button for at least 15 seconds. The Sansa should then begin to turn on and start charging. :)

There may be possible reasons why your Sansa E250 would display an message on the LCD even when you've downloaded files to it: (1) The music file type is not supported by the player. Sansa players support only MP3 and WMA files. To determine what file type your have, right click on the file type and it should display the "properties" dialog box. Check if it is MP3 or WMA. For example, iTunes music files will not work with the player, nor will WAV or MIDI files. (2) Your music files are supported but the bit rate is not within the range that the player supports. Sansa players support MP3 files up to 128 KBPS and WMA files up to 64 KBPS. You may need to use a 3rd party music file editor to convert the files to a supported bit rate (3) You may have saved your music files in a folder and copied the folder to the player. Your Sansa E250 will not recognize folders. Either save them in the root directory or inside the "Music" folder -- your player's default folder for music files. Hope this info helps :)

The only way I know to delete music files or voice or FM recordings, is straight from the User's manual on the CD: 1. Set the e250 to MSC mode. 2. Plug it in to your computer with the USB connector. 3. Open the Sansa e250 drive in My Computer and browse to the MUSIC folder (or RECORD folder)and delete the files there. (That's where you also add music files, by dragging from other explorer windows.) To delete (or add) photo and video files, you have to use the Media Converter, which you install from the disk that came with the e250.