Slow read and write speeds ... for internal storage on Windows requires reformatting and mounting the SD card to the PC. Make sure you have a dedicated SD card slot on your PC to use it.

The slowest read speeds we saw in our most recent tests were above 97 MB/s for SD cards, above 820 MB/s for CFexpress Type A cards, and above 1150 MB/s for CFexpress Type B cards. For an SD card ...

Modern cards are capable of offering storage capacities of well over a terabyte (TB), while maintaining speedy read and write speeds due to their flash-based inner workings. While SD card ...

These cards are marked as either A1 or A2, referring to the SD card’s “input-output operations per second” (IOPS). A1 ...