Docs / Ports

SD card reader

ports.sd-cardHands-on · automaticHigh confidence

How it tests

Waits for a card disk to appear with a size: an mmcblk disk (PCIe readers) or Apple's USB card reader gaining a size. External readers are ignored. Nothing is read from the card.

How it decides

Supported: a card disk with a size. Partial: the card is seen but no disk within 10 s. Failed: the tester says nothing shows up (after 15 s).

How sure it is

A disk with a size is strong evidence.

On a real Mac

  • On a MacBook Air (13-inch, Mid 2012): a 4.0 GB card on Apple's USB reader.

What could mislead it

  • Could pass when it shouldn'tThe card's size reads but data reads fail.