So the 64GB Sandisk is being formatted on another device? Have you done a write test (download h2testw mentioned above) to confirm it is a fully working card?
Yes, it was formatted by another pc (windows 7)… and I’ve copied and read more than 30 GB of data without problems.
I can try to do the test, but do not think it’s a fake … I bought it directly from amazon
The old sandisk 8gb recognizes it without any problem.
The 64gb does not see it right … I tried in ExtFAT, NTFS, FAT32 … nothing.
I am looking for new drivers, but for now nothing