One of the key features of the 2021 MacBook Pro is the return of the SD card slot. However, new laptop users are now complaining about problems with the SD card reader.
In particular, users have reported very slow transfer rates and inaccessible files. As noted by MacRumors, numerous reviews confirm a serious issue on the new 14- and 16-inch 2021 MacBook Pro models.
One 14-inch MacBook Pro user with an M1 Pro chip writes that it takes a laptop about 1 minute to recognize an SD card and an error message pops up from time to time. Another user says Finder crashes when Mac tries to read SD card.
This is very unpleasant. I was hoping that importing from an SD card, including image previews, would be fast on my new 14-inch MacBook Pro. I have a fairly new 64GB SD card that worked fine. But it takes a few minutes to display photos on MacBook Pro via SD card slot and sometimes crashes halfway. Sometimes Finder crashes too.
Another user notes that formatting the SD card through the MacBook Pro does not solve the problem in most cases. Some users also confirm that the same SD card works fine when using a USB-C adapter.
The only thing that is stable is that if the card works, it always works, and if the card doesn’t work properly, it never works. Reformatting even to all other possible formats does not work. Sandisk, Sony, Samsung, 16GB, 32GB, 64GB, 128GB, 256GB, UHS-I, UHS-II, micro-SD, FAT32, exFAT, no difference. 100% of my maps work fine through an adapter.
At this point, Apple has yet to officially acknowledge this issue. It is not yet known if this is a simple software bug or a hardware issue.