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I've switched to only buying SD cards from AAA+ platinum-rated photography websites (B&H, Adorama), they seem to be the only reliable places to buy non-counterfit SD cards these days. I've never had an issue with an SD card since I made this shopping change. Shipping and price are about 10% higher, but guaranteed quality product is worth it.

If you buy your SD cards from Amazon or Ebay you can't guarantee quality for these products.

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What SD brands do you usually buy? Are the Sandisk Extreme range any good?

Sandisk, Lexar, Prograde. Depends on the application.

My raspberry pi doesn't do many disk operations so the speed isn't critical and 90 MB/s is plenty. My digital camera, on the other hand, has dual SD card slots, and can record uncompressed(!) 10 bit 4k video @ 60fps but needs 2 x 400 MB/s continuous write, which is... a pretty specific need. And cost accordingly.

I find Samsung much more reliable than Sandisk in my pis

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