#include <SD.h>
File root;

void setup() {
  Serial.begin(9600);
  pinMode(10, OUTPUT);

  SD.begin(10);
  root = SD.open("/");
  printDirectory(root, 0);

  Serial.println("done!");
}

void loop() {
}

void printDirectory(File dir, int numTabs) {
   while(true) {
     File entry =  dir.openNextFile();
     if (! entry) {
       dir.rewindDirectory();
       break;
     }
     for (uint8_t i=0; i<numTabs; i++) {
       Serial.print('\t');
     }
     Serial.print(entry.name());
     if (entry.isDirectory()) {
       Serial.println("/");
       printDirectory(entry, numTabs+1);
     } else {
       Serial.print("\t\t");
       Serial.println(entry.size(), DEC);
     }
   }
}