My creative Zen 8Gb wont allow more than 597 songs..
I'll run a cleanup on your zen, if that doesn't work then you should format it and re-transfer everything. Additionally, you may want to upgrade your players firmware.
How to enter the Zen’s Recovery Mode for Clean Up, Format All, Reload Firmware, and Reboot:
1. With the Zen off, press and hold the "play/pause" button.
2. Continue to hold until you perform Steps 3 and 4. If you accidentally release the button, start the procedure again.
3. Gently push the end of a
thin object (like a pin or straightened paperclip) into the Reset hole.
You should be able to feel the release click of the button.
4. Slide the On/Off/Lock switch towards the power button and hold until the boot screen appears on the display.
The Recovery Mode screen appears, and four menu items are shown:
A cleanup of the file system and database files takes place. All
(uncorrupted) data should stay in tact. When the cleanup is complete,
select Reboot. Your player restarts and starts rebuilding its music
library. All files should remain intact unless they were detected as being corrupt.
Format All: This will completely reset the Zen and remove all user stored files on it.
This will prepare the Zen to accept a reload, new, or older firmware
based on the specific firmware file you download and execute on a
computer. Selecting this option will prevent your Zen from being able
to boot, so make sure you have the firmware file on you computer and
ready to load.
Reboot: This will execute a soft reboot of the Zen's operating system.
How to Clean Up, Delete Temp Files, and Reformat the Zen using Zen Media Explorer:
1. Plug the Zen.
2. Go to Zen Media Explorer.
3. Select "Settings and Information".
4. Select the "Tools" Tab.
5. This page will show you the options to Clean Up, Delete Temp Files, and Reformat the Zen.
(Warning: When reformatting, you will lose all files you put on the Zen)