New Small MP3 Player not working properly.

Bought this recently :
*cgi.ebay.in/ws/eBayISAPI.dll?ViewItem&item=220442727804

At first i could copy 7 or 8 songs onto the MP3 player.But after that when Itry to copy an error message appears with title as

"Error Copying File or Folder"

and message as below:

"Cannot copy (filename) The request could not be performed because of an I/O device error".

Moreover I cannot delete the songs already on the MP3 player.

Then also an error message appears with title:

"Error deleting File or Folder"

and the message is:

"Cannot delete (filename): Cannot find the specified file.Make sure you specify the

correct path and file name"

Please help.