
I've tried several USB 2.0 card readers that were maxed out at around 40MB/s. I also tried the very popular Transcend USB 3.1 Gen 1 (USB 3.0) MicroSD/SD card reader, but it managed 95 MB/s. At first I thought it might be my microSD cards. Because there are a TON of fakes branded by big brands in the industry (SanDisk, Samsung, Lexar, Delkin) and companies often exaggerate claims. SD/MicroSD cards do not differ in terms of read and write speeds on all types of storage. After several attempts to compare my SanDisk Extreme (UHS-I/U3/A2/C10/V30) 64GB card to Transcend USB 3.1 Gen 1 card reader only to get MAXIMUM sequential read results of 95MB/s, am I then transitioned to another card. They all had one thing in common. 95 MB/s was the maximum. Was it just the most popular highest sequential read speed? While this is a popular read speed metric, as most cards are currently advertised with read speeds of 100MB/s, it wasn't the reason my cards overspeeded. Here are the cards I tested: -SanDisk Extreme (UHS-I/A2/U3/V30/C10) 64GB - Lexar Professional (UHS-I/A2/U3/V30/C10) 128GB - Lexar Performance ( UHS-I /A1 /U1/V10/C10) 32GB - Samsung Evo Plus (UHS-I/U1/C10) 32GB - Samsung Evo Select (UHS-I/U1/C10) 32GB - Kingston Canvas Select Plus ( UHS-I /U1/A1/ V10/C10) 32 GB All these cards are designed for a maximum sequential read speed of at least 100 MB/s with different write speeds. HOWEVER, the SanDisk Extreme is designed for sequential read speeds of 160MB/s. When my Transcend card reader returned a read speed of 95MB/s and a claimed write speed of 60+ MB/s for the SanDisk Extreme, I began to wonder if the bottleneck was what speed was my card, my computer or my card reader. I checked all my other cards and found that none of them could surpass 95 MB/s, although other cards were rated at 100 MB/s and in ratings were 98 MB/s (Lexar Pro/Lexar Performance). Then I looked at the reviews of the Transcend card reader and of course there wasn't a single review from anyone who posted screenshots of Crystal DiskMark, BlackMagic, h2testw or any other performance testing software exceeding 95MB/s! I knew I had identified the problem, card reader! At this point I requested a Transcend card reader return and ordered this Kingston USB 3.2 Gen 1 UHS-II Card Reader. The most important thing to note about this card reader is NOT USB 3.2 Gen 1 as it has the SAME specifications as USB 3.0 and USB 3.1 Gen 1. Most importantly, it's designed for UHS-II cards: that means it can run at UHS-II speeds, which in theory should solve the bottleneck problem I was having before. Well I'm happy to report that he did his job perfectly. This card reader has outperformed Revain's most popular card reader (Transcend). I was able to get speeds of 183MB/s sequential read and 68MB/s sequential write on my SanDisk Extreme. Both DO the claimed specs of the 64GB card (160/60), a very different result from what I had before (fake card or boastful but incorrect specs). I highly recommend this card reader to EVERYONE who wants to test the REAL speed of their high quality UHS-I cards, I haven't found anything that works as well as this reader.

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