Does this reader require special ejection mechanism which (never) works on iMac?

SanDisk Extreme Pro SD UHS-II Card USB-C Reader

SanDisk Extreme Pro SD UHS-II Card USB-C Reader

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1 Answer from the Community

  • You need to 'unmount' the card prior to removing the dongle. This is also known as 'ejecting'. Clicking the Eject button by the reader in Finder successfully unmounts the card for me and I can then remove the card.

    On a side note, if you do have trouble ejecting the card I would advise toggling the 'read only' switch on the SD card before inserting into the reader. This way you are guaranteed that there can be no corruption to the card if you remove it without ejecting/unmounting first. (of course this only works if you're not planning to delete or copy files to the card)