Card reader folded
I normally take the SDXC card out of my camera, put it into an Integral card reader, and plug that into a USB port. This no longer works, and I can’t read the card on my iMac or MacBook. What’s up?
Try a different card, in case that one has become corrupted. If that doesn’t work either, your reader may have bitten the dust.
Many Macs have integral card slots which save you the trouble of using another peripheral. Older iMacs with optical drives have their slot close to that drive. Newer models without optical drives position the slot on the back, by the USB ports. Insert the card the right way round, with the connectors going in first.
Once you’ve downloaded all the images from the card, reformat it. Insert the card into the camera, and use the camera’s menu system to format it. Formatting cards in your Mac isn’t a good idea, as it doesn’t understand the specific folders and other requirements expected by your camera.
Finally, always remember to eject the card properly before removing it from your Mac, either from an integral slot or an external reader. Not only will macOS complain if you don’t, but it can result in damage to the data on the card – even if it doesn’t look like data is currently being written.
Many modern Macs have a built-in SDXC card reader, although the slot’s purpose isn’t always obvious.