was your action deleting or just removing ?
>
Removing Tracks On your player, to remove tracks is to remove them from the Selected Music view only. The tracks are still in the player and can be accessed from submenus like Artists or Albums.
x! To permanently remove tracks, use the delete function. See Deleting Tracks. x!
On the main menu, select Music > Now Playing.
Press OK. In the Now Playing view, the progress bar changes to a rating bar.
Press OK again. The Selected Music view appears.
Press or to select a track.
Press and select one of the following:
Remove > Remove Track
Removes the current track from the list.
Remove > Remove All
Clears the list.
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x!
Deleting TracksThis action permanently deletes tracks from your player.
> To only remove tracks from the Selected Music view, see Removing Tracks. <
On the main menu, select Music.
Select any submenu with audio tracks, for example, All Tracks.
Press or to select a track.
Press and select Delete Track
x!
(details from "view all knowledgebase solutions" on the site of Creative)
http://support.creative.com/Products/ProductDetails.aspx?catID=213&CatName=MP3+Players&subCatID=214&subCatName=ZEN&prodID=17897&prodName=ZEN+Mozaic
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