Lexar 64GB & 32GB SD cards

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When I got 2 5D3s I bought Sandisk 64GB & 32GB cards and I also bought a Lexar Professional 64GB & 32GB cards. I have noticed that when I put the Sandisks into my laptop the show up instantly on the desktop. When I put the Lexar cards in the SD slot on my laptop they often don't show up the first time or take a minute or two. Anyone else experience this? I am just a little concerned there is something not right about them. They seem to be fine in the camera. Maybe I am overreacting.
 
Do you have another computer you can try to read the Lexars on?
If you do, and they are recognized without any issues, then it's a laptop driver problem. If you have the same issue with with another system, might be the cards.
I'm using a new 16 GB Lexar SDHC 400X card and it's read without issues with my desktop.
 
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