games appeared as UNTITLED

recently i download roms here but when i put into my ds card it appears as untitled. the only way to make it work is i have to delete everything in my card and then copy and paste my old games and the new one together then it will work. the problem is I am using a 8gb card which means everythime i wanna add a new game i will have to delete away 200 over games and recopy it very time consuming. and also it may not work always. sometimes have to copy 2 times for it to work. anyone having this problem?? by the way I am using a "R4 SDHC" card.

R4 SDHC is known to have problems with 8GB cards.

Have you updated your firmware? It may help.

well, people say there is a limit. but i didn't know that you could also copy and paste everything to work. and i have tryed new firmware but it didn't work.