SD card shopping guide
With the popularity of mobile phones, smart hardware and portable digital products, MicroSD card has become the most popular choice for mobile device storage expansion. Whether it is Android phones, smart toys, Internet of Things devices, driving recorders, Gopro or Bluetooth audio, raspberry pie, or even Xinjiang UAV, MicroSD is indispensable.

However, in the face of many brands and different parameters of MicroSD cards on the market, few consumers can distinguish their real performance performance, especially in performance-demanding scenarios, such as 4K photography or raspberry pie system disk, how to select the best performance or cost-effective MicroSD is a very headache, because there is no best, only the most suitable.

Recently, Jeff Geerling, a foreign technology blogger, has dedicated a comprehensive performance evaluation report of the mainstream microSD card for us to facilitate our purchase by clicking on the map.

Jeff's test is based on the raspberry pie platform, because the performance of the microSD card has a great impact on the performance of the whole raspberry pie system. Jeff's test platform is the raspberry pie Model 3B+. The test tool used is open source standardized I/O benchmark script (Github). The microSD card products tested include big-name Samsung, SanDisk, Sony, Toshiba, Rexha and some unknown products. The following are the test results:
As can be seen from the above test results, Samsung's Evo + has won the first place in the most important performance indicators of the 4K random read-write raspberry pie storage system. As we all know, the I/O performance of microSD is the main bottleneck of raspberry pie, especially after the latest version of raspberry pie doubles the bandwidth of onboard LAN/WiFi.

SanDisk Extreme and Samsung Pro + have lower read and write performance (mainly 4K read and write) and higher price than Evo + so Evo + is undoubtedly the best microSD storage medium for embedded operating systems (such as raspberry pie, smart hardware, etc.).

If you pay more attention to Sandisk's quality assurance commitment and quality, please note a curious phenomenon. The cheaper Extreme in the above tests is slightly better than the top-grade Extreme Pro in all aspects, especially in 4K (in official data of Sandisk, the writing speed of Extreme Pro is 90MB/sec higher than that of Extreme's 60MB/sec, but in the actual test, the reverse is true).

Summary: Considering the cost-effectiveness, the card with more than 64GB capacity should not choose Sandisk as far as possible. Samsung's pro and Evo + are good alternatives. See reliable, such as mobile phone users, do not spend money to buy Extreme pro, Extreme is enough.

Samsung Pro and Sandisk Extreme and Extreme Pro are the three leading products in the DD test, which are important reference benchmarks for large document reading and writing performance. Therefore, if you buy microSD products which are mainly used for mobile phones, cameras, driving recorders and other large documents with high continuous reading and writing performance, you should choose the above three products.

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