Top positive review
5.0 out of 5 starsAmazon Basics SD card works very good with fast write speeds.
Reviewed in the United States on August 17, 2021
The first thing I do when getting a SD card (or flash drive) is to test its capacity. Regardless of the seller or brand, I fill the media with data to 95-98% of its capacity, then read back the files. Using 2-4GB video files is the fastest way to accomplish the task.
Since I have seen many complains about storage media not having the capacity stated by manufacturers, I need to explain the capacity disparity between storage media capacity stated by manufacturers and Windows OS.
Manufacturers of storage media measure capacity using a decimal system (1GB = 1000MB / 128GB =128,000MB).
Windows OS uses a binary system to measure disk space (1GB = 1024MB / 128GB = 117,000MB ).
That is the reason why your flash drive, disk or SD card might show less capacity than stated by manufacturers. In this instance manufacturers, and OSes such as MacOS and Linux, are using the correct measurement (prefix giga = 1000).
The Amazon Basic SD card work as good as other brand name rated at this speed.
It reached read speeds of 91 MB/s with sustained read speed of 86.4 MB/s while transferring 10.2 GB of data.
It hit a top write speed of 65.1 MB/s with a sustained write speed of 64.3 MB/s while copying 10.2 GB.
On a Mac it went as fast as 74.7 MB/s read and 64.5 MB/s write speed, since the USB reader controller could not go faster.
Many laptops SD slot and card readers might not be able to go above 480 MBit/s (60 MB/s) transfer... so faster SD cards might not be able to achieve their top speed.
The Amazon Basic SD card handles FHD videos @ at 60FPS smooth without skipping. It is fast, consistent, and works in anything that takes a microSDXC or SD card.
I tested the speed on:
Dell XPS 17
ASRock B550 with a USB C 3.1 card reader.
MacBook Pro 13
