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So I got a Rocketek USB-C card reader, and was testing the 400GB SanDisk microSD card I use for my Switch, and used CrystalDiskMark to check if I got any improvements over using a typical SanDisk SD adapter for microSDs (came with microSD) with the slot my laptop has, and my results were disappointing. With the USB-C adapter, I was only getting 15.5MB/s sequential Q32T1 read, whereas the SD adapter was getting almost double that at about 29.9MB/s. All other read tests of 4KiB variations showed the USB-C adapter being lower as well, ranging from 200KB/s to 1.4MB/s. Writing is a bit higher though, with the USB-C being 19.1MB/s sequential Q32T1 write whereas SD being 17.3MB/s. 4KiB write variations were about 200KB/s higher from SD's 1.5MB/s range.
Overall, I was disappointed. I was hoping for even higher sequential read/write, but read wasn't and write was only by a little bit. Could it be that the USB-C reader I got isn't all that great? Thought maybe it was because my card was formatted to FAT32 (for Switch purposes as exFAT sucks on it), so I pulled out a 64GB exFAT card from my phone to compare, and I was getting similar results from both the USB-C and SD adapters as I did from the 400GB card.
Overall, I was disappointed. I was hoping for even higher sequential read/write, but read wasn't and write was only by a little bit. Could it be that the USB-C reader I got isn't all that great? Thought maybe it was because my card was formatted to FAT32 (for Switch purposes as exFAT sucks on it), so I pulled out a 64GB exFAT card from my phone to compare, and I was getting similar results from both the USB-C and SD adapters as I did from the 400GB card.