Creative Zen User Manual page 57

Frequently Asked Questions 57
The firmware upgrade is complete. Reset your player to
enable the new firmware to take effect. To reset your player,
see "How do I reset Zen?" on page 58.
There was an unexpected power loss during audio file
transfer. Use you player only after this library rebuilding is
completed.
Your hard disk drive is updating the tracks in your player.
This occurs after transferring tracks to your player and
unplugging it.