Chose on amazon. I checked the technical parameters on the SanDisk website without fail. Giving money, I hoped for the declared read and write speeds. But, alas, miracles happen only in a mousetrap with free cheese. Verification conditions: - Ryzen 7 1800X CPU - MB Asus Prime A320M-K - RAM 16 Gb - SSD WD Green 120 GB - OS Windows 7 Pro + DR Web Off - USB Flash Benchmark ver 1.0 - OS Linux Mint 19.1 Tessa - ISO image CentOs 10.5 Gb - SanDisk Extreme Go USB 3.1 64GB (SDCZ800-064G-G46) with exFAT file system from the package, The test result (Benchmark) and the actual write speeds (Copy) are very similar, but hopelessly far from the declared characteristics, see the screen under OS Windows 7 Pro. The curves without circles are the read/write characteristics of an "ordinary" JetFlash Transcend 32Gb flash drive. It is possible that such a modest result is a consequence of the "features" of OS Windows 7 Pro, however, tests under Linux showed results that were not much better. I admit that the speeds declared on the packaging are achievable, but most likely in "special" technical conditions to justify marketing "miracles with cheese". SanDisk Ultra Flair USB 3.0 64GB is the closest flash drive in terms of technical characteristics, but unfortunately they are both from the same company, I doubt that it is advisable to check it. The purchased "pig in a poke" turned out to be not the lousiest, but still not the cat he pretended to be.
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