it might have something to do with the size of the save game, being 512k instead of the 1M necessary, there was a thread a while back ago about this.
http://gbatemp.net/index.php?showtopic=141750
mmm.... it is rather small i'd look for something else (4-8gb), specially since flash memory prices are going down quick. unless you want only a small amount of games and music/videos, it doesn't hurt to have extra capacity to spare.
tried replacing the savlib and infolib, everything seems ok the pokemon platinum sav loads no problems. the rom loading is a little bit faster.
thanks niu & bri
credits to boyakkey & 2ch peoples