do I have to turn off the system before take off r4 card

[Minseosaida]

One day, I was using r4 card with 4gb lexar sd card, I often saved the game and clicked home button and turned off then took off r4 card.
Is that breaking sd card and 3ds. Am I doing right way that taking off r4 card because my lexar sd card corrupted.

 

[EmanueleBGN]

You don't have to turn off your 3DS before extract the R4, but you have to exit from the game you are playing.
Your microSD could have been corrupted due to a long reading-writing cycle, or it is a fake card

 

[Minseosaida]

You don't have to turn off your 3DS before extract the R4, but you have to exit from the game you are playing.
Your microSD could have been corrupted due to a long reading-writing cycle, or it is a fake card

Thanks