I can not open or down load songs on it. error-formate only shows

I don't have a solution -- but I have the same problem and this is the first I've found mention of someone else having it. I'm Mac OS 10.6.5. I thought I could go through and just delete the second copies of everything, but I can't figure out how to do that either. They don't show up when it's plugged into the computer. And as far as I can tell, you have to be playing a song in order to delete it, and it can't play things in the wrong format. Beating my head against the wall and starting to look at buying something else... In case you found a solution elsewhere, please let me know!

Hello,

the reason its showing format error is because the songs you downloaded into it is not compatible with the player. For example, if the song you were suppose to download was to be in AAC format, and you put MP3 format, it will show format error because it does not recognize songs in Mp3 format but with AAC format.

Therefore, when you want to download songs into the Mp4 player, make sure the songs are in either WMA or MP3 Audio format. These audio formats are compatible with Mp4 player.

Also, if you want to download videos, make sure they are in MP4 format.

I wish you good luck.

Make sure that the Mp3 player is formatted correctly. Plug it into the computer and in the My Computer screen right click the device, from the pull down format select Format and choose FAT32. This will wipe all the songs from the player, so add new songs, turn on the player and see if it works. If it doesn't plug the player back in and Format it again with the regular FAT setting.

first of all you cant do a quick format you have to open the gpx file and manually delete and make sure your battery is out of the player then open gpx file and youre music file hold down the the mouse button on the song you want and drag it to the gpx file and the release its called drop and drag will not sync up with media players on youre computer will cause a error songs vary in size so wont always get the 200 hundred song that the manufacturer says you can thats based on 3mb per song

please do format the pendrive as fat 32 or NTFS depending on your choice and then try.

Here's what another user did - let me know if it works:
ok so i called 1-866-sandisk and she told me how to fix it. you just flip the key lock at the top so you see orange, then hold down the record button. then you should get some sort of message on the screen. then you plug it in and under my computer a file should show up. you open it and make a folder in it called sansa.fwm (i think thats the right folder name, if not, try sansa.tmp or email me). then you unplug it and it should say formatting or something like that. once its done it should work.

Songs that are in the correct format will show up in the music menu when you disconnect the mp3 player from the computer. Songs that are in the wrong format will not show up at all when disconnected from the computer.

Open Windows Media Player and click on the icon of the Sansa to view what the songs that have been loaded onto there.

The song format is most likely wrong:
read my "Tips and Tricks" on Song formats for Mp3 players: too long to repost here

Song Formats for Mp3 Players Explained
By Tha Mp3 Doctor
I have seen quite a few threads around Fixya in which the stated problem is that the Mp3 or Digital Audio Player will not load the songs; will appear to load the songs but will not actually play them in the Mp3 player once disconnected from computer; will skip the songs on the player, or show only “0:00” for file length; songs “disappear” all of a sudden (although this particular problem can be caused for many reasons not covered in this article); your store-bought/burned/ripped CD’s will not load into your Mp3 player; or get the error message “File Format Not Supported.” All of these problems occur because the user is trying to download a song format that the player does not recognize. Every music file is in a certain format. The most common music file formats are Mp3, WMA, AAC, WAV, RA, etc. Each Mp3 player only recognizes a certain number of these formats. Every Mp3 Player is different. You will have to check your Mp3 player’s product specifications (specs) or user’s manual to find out which formats your particular Mp3 player recognizes. When you try to download or sync the wrong file format, you will get one of the errors that I mentioned above.
Or, it could be a "formatting" issue:
There are two ways to format an Mp3 player - one on the computer itself, and one in Windows Media Player. Both methods will end up erasing all the songs on the player, but the player will be "good as new" after that. Sometimes reformatting in this manner will override the player's native formatting and cause problems - this can be reversed in most cases by updating the player's firmware. Firmware upgrades are available from most manufacturers' websites.

WARNING: The following procedures will erase all songs on the player.

Check if the file system is NTFS. If yes, format it to FAT or FAT32. - Connect player to computer, double-click my computer, right click on icon of mp3 player and select format. This only applies to Windows-based computers.
You can also format the player in Windows Media Player itself:
Connect your Mp3 player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "name of Mp3 player here 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
-Tha Mp3 Doctor

so basically you are having problems transferring songs to your device? if thats the problem try to format your device using windows media player and then try transfer the songs again...what program are you using to transfer the songs to your device?

I have formatted it. No songs available when opened the playlist. But when I start the unit it shows "NoSpaceForDB Please Please Delete More Than4.0M.B". The property shows the "0 Memory is free".