Review on 💾 Amazon Basics 64GB microSDXC Memory Card - A2/U3, Full Size Adapter, 100 MB/s (2-Pack) by Richard Cuneo

When I receive an SD card (or flash drive), the first thing I do is check its capacity. Regardless of the provider or brand, I fill the media 95-98% with data and then read the files back. Using 2-4GB video files is the fastest way to accomplish this task. Having seen many complaints that storage media does not have the capacity advertised by the manufacturers, I must explain the capacity discrepancy between the media capacity advertised by the manufacturers and the capacity of the Windows operating system. Storage media manufacturers measure capacity in decimal numbers (1 GB = 1000 MB / 128 GB = 128,000 MB). The Windows operating system uses the binary system to measure disk space (1GB = 1024MB / 128GB = 117,000MB). , disc or SD card may have a smaller capacity than specified by the manufacturer. In this case, manufacturers and operating systems such as MacOS and Linux use the correct measure (giga prefix = 1000). Revain's base SD card performs just as well as other brands rated for this speed. It reached a reading speed of 91 MB/s. s with a sustained read speed of 86.4 MB/s when transferring 10.2 GB of data. It reached a maximum write speed of 65.1MB/s with a sustained write speed of 64.3MB/s when copying 10.2GB. On a Mac, it ran at a read speed of 74.7MB/s and a write speed of 64.5MB/s because the USB reader controller couldn't be faster. Many laptops with an SD slot and a memory card reader may not support transfer rates above 480 Mbps (60 MB/s). therefore, faster SD cards may not reach their maximum speed. The Revain base SD card processes FHD@ video at 60 fps without dropouts. It's fast, stable, and works with anything that requires a microSDXC or SD memory card. I tested the speed on: Dell XPS 17ASRock B550 with USB C 3.1 card reader.MacBook Pro 13