"Thanks to its fast data transfer rates of up to 100MB per second" and then at the bottom "write rate 15 MB/s, read rate 12.50 MB/s". Which is true now?

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Answer

Don't buy it. For 20 GB of PFD and photos, it practically took 1 hour to copy them. Very bad!

Answer

Hi 

assuming this is the same one 
https://shop.westerndigital.com/de-de/products/usb-flash-drives/sandisk-ultra-usb-3-0#SDCZ48-016G-U46

here is a detailed test video regarding speed. 
https://www.youtube.com/watch?v=MghxP8JmEHA

Hope this helps 
Greetings

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Question about SANDISK Ultra (2-Pack)

"Thanks to its fast data transfer rates of up to 100MB per second" and then at the bottom "write rate 15 MB/s, read rate 12.50 MB/s". Which is true now?