Problems with some games

Hi i just joined this site awhile ago...Alright i'll jumped to the main pointI downloaded the pokemon platinum,pear and diamond but none of them is playable.when i start the game from my R4i,a white screen appear and nothing happens.final fantasy crystal chronical:echoes of time:everytime i save the game,the save file would be deleted right after i turn off or do a soft reset the game.Help please!!NOTE:I"M USING A SANDISK MICRO SD CARD ON A R4i

https://www.romulation.org/forum/index.php?topic=1462.0

well really i think the r4 brand is the most useless
its just me saying

Well i think it's the only card that sells in singapore=.=Err sorry for asking such a stupid question but how do you format the card?

1. Insert into computer
2. Go to "My Computer"
3. Right-click on the microSD card
4. Click on "Format"
5. Click on "OK"

THANK YOU Soooo much!! :D

Have your issues been fixed?

I read somewhere that you should only format a card using something like the hp format tool,as the normal formatting way can damage some cards.

Given the number of people who format normally and never have a problem, I doubt it makes much difference.