First noticed my work PC did not support exFAT. Had to download an update.
Home PC running Linux does not support it either, nor will do in the near future, because the specification is not fully in the public domain and there are many patent issues.
Tried reformatting with Windows, but it only offers NTFS and exFAT in the menu. I downloaded Sandisk's own formatting software to format it to FAT32,
Tested by copying a load of files, it got stuck partway through. Some of the files that appear to be there are write only, and/or return null characters when opened for editing.
From then on, everything is write only or corrupted files. The latter is more worrying, as a file might appear to have been moved there but has been trashed while your PC deleted the original.
I believe cards 'fail safe' by refusing to accept further writes, rather than sending your files to be possibly trashed.
Further formatting (in any format) reports success but later fails when writing files.
This was twice the cost of two 32G cards so same cash per gigabyte value, but has the disadvantage that exFAT is not well supported and it failed after reformatting to other or original formats.
If you genuinely need more than 32G storage, test your SDXC card out thoroughly as soon as you get it. Do not assume it is okay and find out it is not the day after Amazon accept returns (1 month) as I did. . For the record, I have been using a Belkin card reader, not some unbranded reader.
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