Coming from MacRumors, whose readers recently posted on the site’s forum to express their difficulty using some SD cards with these MacBook Pro models.
Notice that it is only some Cards, which are by no means all affected, and the gremlins encountered, differ and include the card that cannot be read at all or may only suffer from sluggish transfer speeds. There does not seem to be any similarity between the types and models of affected SD cards.
A reader writes: “I tried 9 SD cards. When using the MBP [MacBook Pro] SD slot 6 works and 3 does not. All of them work when used with the Apple USB-C SD reader. For some reason the dongle is better than the new MBP slot. The 3 the MBP can’t read are 128GB cards. The ones that can read it are 64 GB. “
Another adds: “Same problem here (new 16 inch MacBook Pro). In older Sandisk 64GB and Panasonic GH5s, the built-in SD reader is slow as molasses and often fails. The card works perfectly with the USB-C dongle SD reader. “
And another reader notes: “My 32 GB sandisks (2 of them) worked, albeit slowly, like molasses on a cold day. My 64GB Sandisk works like lightning. The 32 GB sandisks were put down for 2 more of the 64 GB variant and the SD cards all work like a champion. There must be a software problem hiding here somewhere. “
The original thread is now nine pages long so there seem to be a few people out there who are having issues with their 14-inch MacBook Pro and 16 inches portable.
You can find similar articles on Reddit according to the motto ‘so far only half of mine [SD] Cards work ”.
Analysis: Perhaps a software bug – and was it resolved during testing?
The general theory of what the problem could be – and remember, these are only people’s guesswork – is that it could be a software bug macOS Montereywhich certainly seems like a possibility. And better than the possible alternative that the actual SD card slot itself has a very strange bug.
Of course, we need to remember that these are only reported issues at this point, but there seem to be quite a few of these on various online forums. So, as you can imagine, Apple will investigate this.
There’s a bright spot here, however, and that is a contributor on the MacRumors thread who stated that they have just been upgraded to macOS 12.1 Beta 4 and SD cards that were previously problematic are now working fine, suggesting that Apple has the problem may have already addressed during testing.
They said, “Yes, no problems for me. Tested two drives that I had problems with before. Write / read speeds correspond to the specifications for these drives. Looks like they did. But let’s wait for other people’s comments to celebrate. “
This is only a single report, of course, and as the poster notes, it is certainly too early to celebrate, but hopefully this is a promising sign.
We have contacted Apple and asked the company to clarify this matter and will update this story if we hear anything.