deleting empty files

Other Hardware Storage
1

(Arduino Mega)

Hi,
I want to delete empty files in my SD Card. I use the SdFat library. My script correctly identifies them, but I cant delete them. Above id the full script. The critical lines are at the end.

Thanks for helping.

#include <SPI.h>
#include <SdFat.h>

void setup()
{
	SdFat sdCard;
	FatVolume *volume;

	pinMode(53, OUTPUT);
	Serial.begin(115200);

	if (sdCard.begin(8, SPI_HALF_SPEED))
		Serial.println(F("card found"));
	else
	{
		Serial.println(F("No Card"));
		return;
	}

	volume = sdCard.vol();
	if (!volume)
	{
		Serial.println(F("unreadable card"));
		return;
	}

	File root = sdCard.open("/");
	while (true)
	{
		File entry = root.openNextFile();
		if (!entry)
			break;
		if (entry.size() == 0)
		{
			// THIS BLOCK SHOWS ME CORRECTLY THE FILES I WANT TO DELETE
			char n[20];
			entry.getName(n, 20);
			Serial.print("delete ");
			Serial.print(n);
			
			// THIS LINE DOES NOT WORK. I NEVER GOT THE 'OK'
			Serial.println(entry.remove() ? " ok" : " fail");
		}
	}

	// THIS INSTRUCTION CONFIRMS THE FILES ARE STILL THERE
	sdCard.ls(LS_R | LS_DATE | LS_SIZE);
}

void loop() 
{
	Serial.println("Done");
	while (1);
}