SD library. Can't detect when the card is removed.

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Hi,
I have a problem with SD library: www.arduino.cc/en/Reference/SD .

I've tried to detect the moment when the SD card is removed and it is not possible.

For example when I write data to file and remove SD card, function

File dataFile = SD.open("filename", FILE_WRITE);

still returns TRUE.

I've tried the same with other functions like exists or begin.

Thanks for help, Peter.