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  1. #1

    Member Since
    Jun 14, 2018
    Can’t erase SD card that is unreadable by iMac
    I have a MacBook Pro and a 27 inch iMac that are both using macOS Sierra v 10.12.6. I have a San Disk 64GB SD card that is unreadable by either of my apple computers. I have followed the steps to use disk utility to erase and rename my card but when I click “erase,” I end up with the message “erase process has failed.” When I click on “show details” it says “MediaKit reports not enough space on device for requested operation.” What gives? Did I waste 40 dollars on this SD Card? Do I need to by a windows computer just so these types of things can be more easily fixed?

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, OS X.13.5
    SD cards have a high failure rate. Take it back.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Check the card closely to see if it has a "read-write" switch. Sometimes they're hard to spot. If it has one, just set it so that you can write to the card and then you will be able to erase and format the card. If that particular SD card has no read-write switch, then it's probably defective and should be returned for a refund.

  4. #4

    IWT's Avatar
    Member Since
    Jan 23, 2009
    Born in Scotland, Worked in Scotland then England, Now live in Wales
    Late 2015 5K 27-inch Retina iMac, 4GHz i7, 32GB RAM, 1TB Flash Drive, macOS Sierra 10.12.6
    Hi Ricky

    I agree with the comments made by ny senior colleagues.

    Just one additional thought. You imply that Disk Utility can see the card when mounted.

    Does it just show one volume or is there an indented volume below the name of the card?

    If there is an indented volume shown, try clicking on that one and formatting the disk.

    If still no luck, then replace it.


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