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 Quartreal Eagleman

I used to be a fan of another popular similar memory reader made by a memory supplier that was in the same price range (if you are looking for that based on the reviews/ reviews you won't miss it) but after my second one died after too short a period of light use I decided 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 on 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 (quite full). the rate that can account for the system deviation is slightly lower than the claimed rate). When using memory cards with a capacity of 64 GB or more, the ability to read/write at full speed is important. Reading/writing to both cards at the same time results in a performance penalty - much 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. The write speed seems to be on the lowest common denominator here (a little over 4 MB/s is the write speed of a Sandisk card 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 ran the evo dual test again with a USB 3.1 Gen 2 (USB-C, 10 Gb/s) port, averaging 10 MB/s writing and 22 MB/s reading (some speed drops reached the same values as before) Like in the previous tests, given that the repeated sample size was tiny, I would attribute the "faster" speed to mere differences in testing and would say the USB-A and USB-C tests were identical, which is to be expected since Device is only USB 3 at 5Gb/s so a 10Gb/s port doesn't help it run faster). I hope this reader lasts a decent amount of time, if so I've found a new favorite.