I've been told to be weary of buying electronics from third party re-sellers on Amazon, but "Ships From And Sold By Amazon" is supposed to be a guarantee you're getting genuine product... or maybe not.
Purchased directly from Amazon, these Samsung MicroSD cards are advertised as having read-write of 200MB/s and 130MB/s, but CrystalDiskMark shows the performance is less than 1/4 of advertised speed. A manual file transfer also confirms these cards are slower than a much cheaper card I bought years ago.
At this point I don't know if my trust was broken by Amazon or Samsung.
"Buyer Beware"
Purchased directly from Amazon, these Samsung MicroSD cards are advertised as having read-write of 200MB/s and 130MB/s, but CrystalDiskMark shows the performance is less than 1/4 of advertised speed. A manual file transfer also confirms these cards are slower than a much cheaper card I bought years ago.
At this point I don't know if my trust was broken by Amazon or Samsung.
"Buyer Beware"