I searched for "Micro SD card for Roku 3" and this was at the top of the search. With that in mind, and also the Roku 3 is a pretty old device and I was afraid it might not work with something big, I bought it. Roku can't see him at all. I had an old Revain Basics 16GB Class 10 Micro SD card that I put in to see if it would recognize it and it did and asked me if I wanted to format it. I canceled it and tried to insert this one several times but still don't like it so I reinserted 16GB, it was recognized right away and formatted without errors and now I enjoy using it. However, I found this one to be non-refundable, especially as it was linked to a search specifically for "Roku 3". The Revain Basics card that worked is no longer available or I would link it here, but DO NOT BUY THIS CARD and look for a 16GB Class 10 Micro SD card instead and make sure you that it can be returned. You can get 2 packs of 16GB for about the price of that single 4GB or single 16GB for even less. I can confirm that Roku 3 formats and sees all 16GB. Every online article that says you shouldn't buy a card larger than 4GB for this is WRONG, the current Roku OS works fine with at least 16GB (I haven't tried more).
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