Few of the cards we tested were rated for A1 (and none for A2) as 32GB cards don’t tend to have this classification. Cards can be rated either A1 (1,500 IOPS random read / 500 IOPS random write) or A2 (4,000 IOPS random read / 2,000 IOPS random write).
![micro sd usb card reader micro sd usb card reader](https://image.made-in-china.com/2f0j00SmEtZRbcHgkr/USB-2-0-OTG-Card-Reader-2-in-1-Micro-SD-Card-Reader-USB-OTG-TF-Card-Reader-for-OTG-Smartphone-for-Mirco-SD-SDHC.jpg)
Here are some other cards we tested and our brief take on each. Not every product deserves to be listed as one of the best Raspberry Pi microSD cards. Other Raspberry Pi microSD Cards We Tested
#Micro sd usb card reader plus#
On the Raspberry Pi 3 B+, the Evo Plus got really good application open times and slightly better 4K writes. The card had solid transfer rates in IOzone, though its 4K random writes were a little disappointing (rates were much higher in the Raspberry Pi Diagnostic test).
![micro sd usb card reader micro sd usb card reader](https://images.channelgrabber.com/ODEy/5547cf99ad8f4.jpg)
It also booted in a speedy 24.7 seconds, only 0.7 seconds slower than the Kingston Canvas React. In our tests on the Raspberry Pi 4, the Samsung Evo Plus offered consistently strong application opens, coming within 0.2 to 0.3 seconds of the leader.
![micro sd usb card reader micro sd usb card reader](https://img.tvc-mall.com/uploads/details/840200254A-1.jpg)
Most of us probably aren’t worried about submerging a card in water, but it’s nice to know that if you waterproof your Raspberry Pi, the card will be fine too. Samsung backs the Evo Plus with a 10 year warranty and claims that the card can survive X-rays, magnetic radiation and even 72 hours in seawater. Selling for a modest $8.51 (£7.29) at publication time, the Samsung Evo Plus offers solid performance from a highly-trusted brand at a very reasonable price.