For example, MP3 files purchased through iTunes are only capable of being played on five devices. If your audio file type is supported by the player and it still won't play, you may not have permission to play the audio file on the device.You may be able to load an audio file that isn't in a supported format to your MP3 player, but it won't play when you select it. The SanDisk Sansa Zip Clip only supports audio files in the WMA, MP3, secure WMA, WAV and Audible formats. If a song won't play on your Sansa Zip Clip, double-check the following: If you experience this problem on a regular basis, try updating the MP3 player's firmware as outlined in the Update SanDisk Clip Zip Firmware section. Click 'Action' along the top of the program window and then click 'Scan for Hardware Changes.' The computer will detect your device and reinstall your drivers.Right-click the name of your MP3 player and then click 'Uninstall.' The device's driver is now uninstalled.The driver needs to be uninstalled and then reinstalled. If there is a yellow exclamation point next to your MP3 player's name, then there is a problem with the device's driver. Your device will be listed under one of these options. Click the expansion boxes to the left of Portable Devices and USB Mass Storage.Click the expansion box to the left of System Tools and then click 'Device Manager.' The Device Manager appears on the right half of the program window.Click 'Manage' to open the Computer Management window.In Windows, open the Start menu and right-click 'Computer.'.Reconnect the MP3 player to your computer using the USB cable.The SanDisk Clip Jam, on the other hand, has a low-res screen that lets you tune into an FM radio station or peruse all of your music, podcasts and Audible audiobooks, as well as the contents of the aforementioned microSD card expansion slot. The Shuffle has no screen to choose what you want to listen to. However, aside from looks and a battery (similar to the Shuffle, the Clip Jam averaged about 20 hours in the CNET Labs battery test), they don't have much in common. The built-in clip that sturdily keeps it in place while on a run makes it comparable to the iPod Shuffle, which has a similar design.

But it won't work with any subscription music services, nor will it work with the old copy-protected iTunes purchases made before 2007. In addition to MP3, it's compatible with WMA, WAV and AAC files - such as the ones you purchase from iTunes or Amazon.

Though its sound quality can't compare to expensive high-res music players, the Clip Jam sounds fine - unless you're audiophile, you won't notice the difference between listening to this or an iPod. (The Clip Jam shows up as an external drive when connected to your Mac or Windows PC.). Best of all, you don't have to use iTunes to transfer your music - just drag and drop your music files.

Mac software for sansa clip