Micro SD card with exFAT won't load more than 4GB. Why?

I formatted the card with both the PC and the phone to exFAT, but unfortunately, after loading a large amount of data (more than 4GB), certain files disappear after inserting the card to the phone. If I paste more than 4GB of data, it takes minutes, followed by hours.

How do I solve this problem? Did I purchase a fake card on Amazon? I am using a Sandisk Ultra Micro SDXC card in a Verizon Samsung Galaxy S4.

If still bad, and for other ideas, and for more certainty, also you can send the question to the Support Team :

Link: http://kb.sandisk.com/app/ask/

I am experiencing the same exact issue. Put files on card (some of which took forever) and then go back to double check… and they would be gone.

I have the 64gb ultra  … and Verizon s4. But the phone doesn’t matter because the card hasn’t even been in the phone yet…

:smiley:   Hi Nu2droid,

Dear member of SanDisk Community, welcome.

If still bad, well, perhaps the card is fake, of 4 GB.

  • Then you can verify, with these apps portable (free), _ if it’s fake: _

                      USB Flash H2testw,    http://filecloud.io/jl4fhn9b       -It’s the classic utility, but for 64 Gb, it takes ~ 4 hours.
                      USB Flash FakeTest,  http://filecloud.io/n074g3x5    -It’s similar, but has a quick option, and takes minutes.

  • To obtain the i_nternal data_ of the UFD, you can use (apps portable, free): USB Flash ChipGenius,  http://filecloud.io/rqa7etmv
                                                                                                                                          USB Flash DriveLetter,    http://filecloud.io/vgqzcdyh
                                                                                                                                          USB Flash Deview,          http://filecloud.io/srp2hegw

Luck, and then you tell us, what happened, please.

Regards, Alfred.                                                            (Google translated)