(in Sd Card) can i copy the entire file and rename it ?

I thought it would waste space to repeat it, but... sigh

 #include <SPI.h>
#include <SD.h>

char* file_name1 = "flor1.jpg";
char* file_name2 = "flor2.jpg";
byte ibuffer[3000];
int ibufferspace = sizeof(ibuffer);
File File1;
File File2;

void setup() {
 Serial.begin(19200);
 Serial.print("Initializing SD card...");
 pinMode(53, OUTPUT);
 
 if (!SD.begin(53)) {
   Serial.println("Initialization failed!");
   return;
 }else {
   Serial.println("Initialization done.");
 }

 File1 = SD.open(file_name1);
 if (File1) {
   Serial.println("Opening the file: " + String(file_name1) + " done.");
 }else {
   Serial.println("Error opening " + String(file_name1));
 }

 if(SD.exists(file_name2)) {
   SD.remove(file_name2);
   Serial.println("File :" + String(file_name2) + " deleted...");
 }

 unsigned int previoustime = millis();
 if (File1) {
   File2 = SD.open(file_name2, FILE_WRITE);
   if(File2) {
     int i=0;
     while (File1.available()>0) {
       ibuffer = File1.read();
       i++;
       if (i==ibufferspace) {
         File2.write(ibuffer,ibufferspace);
         i=0;
       }
     }
     File2.write(ibuffer,i-1);
   }
   Serial.println("Done copying...");
   File1.close();
   File2.close();
 }
 Serial.println("Time: " + String((millis()-previoustime)/1000) + " seg");
}

void loop()
{
 // nothing happens after setup
}

I compiled for a Mega 256 with Arduino IDE 1.6.5 and got the error message above.