I was not trying to direct anyone to SanDisk, but rather offer an explanation of the the different classes and criteria.
It is my opinion that some of us our procuring expensive cards that are probably unnecessary for our needs.
I know my lightening 3.0 port on my MacBook Pro downloads the QXD at light speed .. and handles burst mode buffering with ease on my D850 .. , but the fastest cards are not for everyone ...
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