How do I put music onto a sansa sandisk m240?

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try formatting it...90% of the times it will solve your problem.

try formatting the device..that must solve the problem...if it doesnt,use sansa updater to update its firmware

How can I delete music from my Sandisk Sansa m240

where should i get my music download or uploaded from because it will not work in windows media player

To format the player directly, follow these steps:
1. Press the Home button to return to the Main Menu.
2. Select Settings from the Main Menu.
3. Select System Settings.
4. Scroll down to Format and select it.
5. Select Yes to start formatting.

Hi Sir
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If you didn't found Your Favorite Music In Youtube Try These Sites : Beemp3.com or 4shared.com

I would recommend that you update the firmware on your device..that usually solve the problem you are having..To update the firmware, follow the link below..
http://www.sandisk.com/DriverDownload/download.asp

I hope that helps
Please rate accordingly
Thank You
Computerrep

you need to format like new one

This error message may largely be due to the corrupted Music Database file that the Sansa M240 creates to maintain an information pool on the music files downloaded to it. Normally, if you are unable to completely format the player in Windows Explorer, there are still 2 other (and actually, more recommended) options that you have: (1) Switching the M240 to MSC mode and formatting in "Disk Management". You can get to this window by right-clicking the "My Computer" icon and selecting "Manage". Make sure that you use the FAT file system to optimize the 1GB memory (2) Switching the M240 to MTP mode and formatting the player in Windows Media Player 10 or version 11. The mode of the M240 can be changed by accessing the menu and going to "Settings", then choosing "USB" In general, formatting the player in "Disk Management" is more effective than formatting it in Windows Explorer. Also, it would be a good idea to upgrade the player's firmware to the latest version via the SanDisk website: http://www.sandisk.com/Retail/Default.aspx?CatID=1376 I hope this helps. The M240 is a great player.