Review on uni USB C SD Card Reader Adapter USB 3.0 - Supports SD/Micro SD/SDHC/SDXC/MMC - Compatible with MacBook Pro, MacBook Air, iPad Pro 2018, Galaxy S20, Huawei Mate 30, and More by Josue Porter

this by rating/reviews you can't help but after my second one died after too short a period of light use i decided to that it was time to try another brand. My attention was drawn to the dual USB-A and USB-C ports, as well as the ability to read from two memory cards. There's no reason a reader should be expensive, as low cost was also an important factor. I often do a lot of operations with large files, so being able to run memory cards at full speed is important. I have to report that my Samsung Evo microSD cards read at almost a full 45MB/s and write at 22MB/s (close enough to full speed that system variances could account for the slightly slower than advertised speeds). When using memory cards with a capacity of 64 GB or more, the ability to read/write at full speed is important. Simultaneously reading/writing to both cards results in performance degradation - far more than a simple speed reduction due to difference sharing. My Evo card's write speed drops below 4MB/s while at the same time writing to an older Sandisk SDHC card at 15MB/s. It seems, that in this case the write speed works with the lowest common denominator (the write speed of the Sandisk card is just over 4 MB/s in the separate test). This behavior also applies to reads, around 15 MB/s, which is the maximum for a slower card. As a test, I put an identical Evo card in the SD adapter and repeated the tests with identical memory cards. This time I saw write speeds of 9.5 MB/s on each card (close to 50% of the single card test) and read speeds of 21.5 MB/s (again close to 50% of the single card test). I rarely need to do concurrent read/write operations, especially on different card types, so this limitation doesn't matter. The tests were carried out with the USB-A connection. I have the evo again with a USB 3.