cd says 2mg but file on it has740mg!!!

[seand006]

Hi
This is my first time using this forum so I hope Im in the right spot ,If not am hoping someone will point me in the right direction.Am trying to copy a vcd, when I click the properties of the cd in the drive it says tha it has 2.15mg in total but having cone to the mpeg folder the actual image data is saying712mg so who ever has made this cd has put a copy on it by bumping up the size of the file as a sort of a ghost so I cant copy it is this right??? can anyone tell me how to get rid of this extra large gost data!!! hmmmm hope this aint to silly a question as I am new to this many thanx.
Sean.