Great idea . Thank You ! It worked nice , except the time . The normal copy process of a 16,5MBytes file lasts 24 seconds . The copy process using low level functions in MS Visual Fox lasted 75 seconds for the same file (!). In the do ... while routine I introduced the Fflush() function and the process lasted 28 seconds because I noticed that most time was lost at the end of the copy process (the transfer from cache memory). Sorry for waisting your time if you already knew all these . Good luck !