how can i completely clear my mp3

it shows up when i p[lug it in but it dosent show any of the music. how do i completly erase everything on my mp3 if nothing shows up when i plug it in???

Format it.

My c150 SanDisk (2GB)  got hanged up while copying.  When reconnected agan showed error and aksed to format it.  After formatting complete it shows no songs in it.  But the memory is full when copying some files or when we check the property the memory is ‘0’.  Kindly help with your techniques to make use of my player.

Thank you.

Format the player, and then format it again when you connect it to the Windows Media player.

Always cleans mine out.