I bought a 64 GB MicroSD card for 539 rubles, which says 100 MB / s read, 45 MB / s write. I measured the speed, it turned out to be even faster.
Both on the package and on the card itself there are U3 (recording at least 30 MB / s) and V30 (video recording at least 30 MB / s) icons.
I installed the card in a high-speed card reader ORICO CRS12 USB3.0 5Gbps and connected it to a USB 3.0 computer port.
The maximum read and write speed is about 79 MB / s.
AS SSD Benchmark showed significantly lower write speed.
USB Flash Benchmark "explained" everything - on blocks of 16 MB the write speed is maximum, on blocks of 8 MB and 4 MB it drops almost twice, and on blocks of 2 MB and less everything is fast again.
I will say a few words about the speed classes that many pointed to when I wrote about the Kingston Canvas Select Plus 128 GB memory card (https://ammo1.livejournal.com/1285394.html). The speed class shows only the minimum guaranteed recording speed, while in reality the speed can be much higher. Moreover, I fully admit that there are U1-class cards in the world that work faster than U3-class cards. Here's a simple example - the usual SanDisk Ultra MicroSD 16 GB, on which only the tenth grade is written (this is a 10 MB / s write).
And at the same time, its write speed is as much as 47 MB / s.
Back to the Lexar card. The results are excellent, and it cost almost as much as regular U1 cards from other brands. I bought it in Ozone, but there they are already over.
upd.: Two things appeared: https://www.ozon.ru/product/karta-pamyati-microsdxc-lexar-64-gb-256749146
© 2021, Alexey Nadezhin
For ten years I have been writing every day about technology, discounts, places of interest and events. Read my blog on the site ammo1.ru, v LJ, Zen, Mirtesen, Telegram.
My projects:
Lamptest.ru. I test LED lamps and help figure out which ones are good and which are not so good.
Elerus.ru. I collect information about domestic electronic devices for personal use and share it.
You can contact me in Telegram @ ammo1 and by mail [email protected].