As reported by Macrumors, several MacBook Pro users
are reporting super flakey and inconsistent performance with the SD
card reader. The reports are somewhat varied, but seem to be
related to the reader rather than a specific card, with the issue
affecting various types and models.
The new MacBook Pro supports several
varieties of SD card, including MultiMediaCard, Default Speed,
High Speed, UHS-I, and UHS‑II cards. MiniSD and MicroSD are also
supported via an adapter. The issues described appear to be
software related and not due to failing hardware or incompatible
Some users report that macOS Monterey 12.1 fixes the issue, while
others say it persists after installing the beta. Several users who
have discussed the issue with Apple support representatives say
they're been told that the company is aware of the issue and a fix
is indeed coming in a software update. Apple released the final
version of 12.1 on Tuesday, so it could contain a fix.
macOS 12.1 is due to release in the coming days, with the
release candidate pushed to developers and beta testers this week.
It includes SharePlay and several major bug fixes, including one
where the MacBook Pro doesn't charge via MagSafe with the lid is