EDIT: To summerize my post below, I've been using an R4-III Upgrade and 4gb sdhc card for along time w/ no problem. I just now tried to upgrade to an 8gb card. Everything I copied directly from my 4gb card will work, but nothing else will. Any games moved on from my old collection on my pc, or newly downloaded games wont work. I dont get a chance to even try to play the actual game, the files on the R4 menu get glitched up when I open the folder containing one of these games. That, and the New folders I made containing only new games will glitch up in the same way when opened, even though all the games inside are also in the own folders. I hope this clarifies some things. It was late when I posted last night. You Can read the rest of this post for more details, or go right to my second post for some tests I did on this today. I've been using an R4-III Upgrade now for about a year or so [maybe 2 now] with no problem at all. I know its one of the crappy clones, but I got it cheap, and its been working pretty well. EDIT: after typing all this, I have to say props to anyone that can read and actually understand all of this without mixing up any of the details. you have really good reading comprehension. lol Anyway, I've been using a 4gb sdhc card, and for most of the time, whenever I wanted to play a new game I'd have to move some games back to my PC. So I recently ordered an 8gb sdhc which just came in the mail today. I did a quick format [in FAT32] and copy/pasted everything from my 4gb card. B4 I popped it in though, I also went into my game collection on my pc and put back several games that I'd erased from my card earlier, along with a bunch of other old games that I never had room for. also, it should be said that I keep all the games in my sd card categorized into folders [ie, stylus games, rpgs, ect], and that I put the games I had previously erased back into their original catagory folders, and for the games I never put on the card before, I made new catagory folders for. Additionally I keep every single game in a folder of its own [within the category folders I previously mentioned], so that the save file is kept with the game file and they are both easy to find. Bare with me please. I know this is convoluted, but there is a reason I had to explain the folder thing. The following is the result of what happened after I tried to boot this all up on my new 8gb card: everything I copied directly from my other card worked normally, but everything I put on from my collection afterwords did not. I always kept and used games from this collection without ever seeing problems until now. In the case of the games that were put back in the same catagory folders as my other working games, I only get a problem when I go into the folder of a specific game. In these catagory folders the game folders are listed with no abnormalities, but if I try to open a folder for a game that I added from my PC today all I see is giberish instead of the files that should be there [the .nds file, and the .sav file which shouldn't be visible]. sometimes I can still move the curser up and down, but I can't back out of the folder so I need to shut the DS off. In contrast, If I just try to open one of the new catagory folders I made for the games I never had on my card before, I'll get the same problem mentioned before, but it will happen right in the catagory folder, as opposed to after I open a specific game folder [these games are also all kept in their own individual folders]......... ie, in the catagory folder, I will see giberish where all the game folders should be [and need to shut off the DS]. In the regular catagory folders [ie, not the new ones] I took the time to try and open almost all of the game folders, mostly confirming that this problem lies entirely and exclusively with the games that I copied onto the card after directly transfering the contents of my old 4gb card. Why would these specific games not work??? they all pretty much come from the same sites online [I only ever used 2] and all always worked in the past. atleast the onles that I'd tried previously. For some reason everything transfered directly from my old card remained intact, but nothing else will work. for now, I can continue to use my 4gb card. but I'd really like to start making use of the extra space in my new card. Also, I'll try downloading a new game online [and maybe redownload an old one too] and test it on both cards, than post back. maybe that will make this clearer. Sorry for making this so long and convoluted and explaining the intricacies of how I organize my files and folders , but these details seemed important to me as far as why they're not working. Anyway thanks to anyone that bothers to read all this and tries to help.