Page 383 - 최강 아두이노 퍼스트 참고서

Serial.println("initialization done.");
root = SD.open("/");
printDirectory(root, 0);
Serial.println("done!");
}

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

void printDirectory(File dir, int numTabs)
{
while(true)
{
File entry = dir.openNextFile();
if (! entry)
{
// no more files
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
{
// files have sizes, directories do not
Serial.print("\t\t");
Serial.println(entry.size(), DEC);
}
entry.close();
}
}

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