MP3 Player plays only 25 songs, capacity 1GB (861 MB)

well, as for your memory problem, 300MB can be used by the operating system of the device.

It is alone to format in FAT32 and later in FAT, and tries to transfer musics again.

Sounds like the player needs to be reformatted. Make sure your mp3 player is fully charged and then go to Sony's help site for your player:
http://esupport.sony.com/US/perl/model-home.pl?mdl=NWZB105F&LOC=3

I just got one. Cute little thing at a cheap price. Plug it in and my virus checker wants to delete the program. Tell it that the program is OK and to leave it alone. In XP it put two drives on my system - a AMT CDROM drive and an AMT MP3 drive. Ignore the CDROM drive, at least at first, and copy your music files to the MP3 drive. The key to making it play does seem to be holding down the play button while flipping the power switch to ON. Having it on or off when unplugging from the computer does not seem to matter.Who knows how long to charge it at first?

What format is it? if it's something like AVI it wont work.

Hi,
Follow These Steps:
1. Switch OFF your MP3 player 2. Unplug the cable from Computer 3. HOLD "PLAY" button WHILE you PLUGIN the CABLE with MP3 player.
The MP3 player will now reboot, you can see the welcome screen after few seconds.
4. Go to My Computer > Select the MP3 drive > Right Click > FORMAT > File Format : FAT32 > 
After format completes, Unplug the Cable from Computer. Wait few seconds.
5. Plugin the cable with MP3 player.
6. Go to My Computer.
You can now see the MP3 player drive. You can copy paste the media files into the drive. After you complete the file transfers, you can unplug the cable from PC and listen to the songs asusual :)

I've bought the same mp3 player and its working great !

you cant expect all mp3 players to play as many songs as u wnt. each mp3 player has a limit of memory card that needs to be attached. see whats the maximum memory your mp3 player can support. and also see if you can locate all the songs when the SD card is connected to your computer

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, click my computer, right click on icon of mp3 player and select format.
You can also format the player in Windows Media Player tiself.
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.
You may also want to check
http://support.rcaaudiovideo.com/downloads.aspx?product=25
for any firm updates - the above procedures in some cases undo the original formatting on the player, and a firmware upgrade will be required to replace the Mp3 player's formatting.
-Tha Mp3 Doctor

The songs are in the wrong format

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

a friend gave a this mp3 player and told me if I can get it to work its mine. I can transfer information, but can't make it play