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  1. #1
    Can't Erase Micro-SD Card - Problem Resolved
    krs's Avatar
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    Can't Erase Micro-SD Card - Problem Resolved
    I ran into this problem yesterday and thought I would post the issue and resolution for anybody else who may run into this problem.

    Had a SanDisk Micro-SD card (also called TF card) that I had used in a camera and that I wanted to erase and reformat to ExFat.

    I plugged the TF card into an SD adapter so that I could plug the card with adapter into the SD slot on my Mini.
    Card showed up on my desktop - I launched Disk Utility, selected the card and erased it.
    Got the message "Erase process has failed"
    Erase Failed.jpg

    Couldn't modify partition map? Hmmm... maybe I couldn't use ExFat for whatever reason, so I tried to format to MS-DOS
    Same problem.

    Was the card defective? Unlikely since there were images on the card that I could open on the Mac with no problems.

    So then I decided to put the card back into the camera and try to use the camera to reformat it (even though formatting that way would not be what I wanted, but I could at least delete the images on the card and maybe then format it)
    I put the card back into the camera (with the adapter since the camera took a full size SD card) and then my 10+ year old camera came back with the message "Card Locked"

    Sure enough, that was the problem - a 10+ year old camera could give me that feedback, but my much more recent macOS could not. it just said:
    Couldn't modify partition map
    Operation failed...
    which gave me no hint what I should look at to try to fix the issue.

    And what didn't help at all either is that SanDisk on their Micro-SD to SD Adapters brilliantly cover the 'Lock" and arrow indication on the adapter with the SanDisk label.
    SanDisk.jpg

    I slid the lock up to the 'unlock' position and erase worked just fine.

  2. #2
    Can't Erase Micro-SD Card - Problem Resolved
    IWT's Avatar
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    Thanks, krs. Useful tip. I wouldn't have thought of a locked card, though they were common enough a few years back.

    Ian
    Ian

  3. #3
    Can't Erase Micro-SD Card - Problem Resolved
    pm-r's Avatar
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    And what didn't help at all either is that SanDisk on their Micro-SD to SD Adapters brilliantly cover the 'Lock" and arrow indication on the adapter with the SanDisk label.

    Someone sure didn't have their brain engaged... who would've known...???

    Thanks for the heads-up.



    - Patrick
    ======

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