have already had other cards as ADATA or patriot unfortunately these cards went broke after about 2 years! have chosen this card because I have samsung devices smartphone tablet, etc. and hope that last longer than the others so far adheres ddie memory card well please watch this trail here is an SDXC card! This means that this is a completely new format previously was indeed the popular SDHC! What bothered with SDHC was with FAT 16 or 32 format, the 4GB limit of the files! falling jetz with SDXC cards away if you formatted it in exFAT! newer smartphones from S3 i9300 support this format and we should use it to the exFAT format offers more than the usual fat 16-32 format! It is located in faster and write! as I have said so far everything bestenst with the map .Eins should also be clear that you do not have 64gb but 59gb please google and here it is a class 10 card what does that mean here read "[...]".