MacOS – Unable to format the memory card/SD – error -69877 couldn’t open device

command linedisk-formatmacossd cardterminal

I can't seem to able to format my PNY 32 GB SD card

When I go to Disk Utility and try to erase it gives me error: Unmounting disk, Couldn't modify partition map and operation failed

I successfully unmounted disk2 (the SD card) via terminal but when trying to erase it it shows error -69877 couldn't open device

I also tried command sudo dd if=/dev/zero of=/dev/disk2 bs=1024 count=1024 but it shows permission denied

System: OS X El Capitan 10.11.6

Can you help please?

Best Answer

I had the same problem, but per this Mac Forum discussion, SanDisk Micro-SD to SD Adapters has a 'Lock" slider that is easy to miss. After unlocking the card, I was able to reformat the microSD card with no problem.

Related Solutions

How to create an applescript for multiple dd terminal commands in sequence (for multiple USB Drives duplication)

You can do this with a bash script.

#!/bin/bash

SOURCE="/Users/username/Desktop/source.img"

dd if=$SOURCE of=/dev/rdisk1 bs=1m
dd if=$SOURCE of=/dev/rdisk2 bs=1m
dd if=$SOURCE of=/dev/rdisk3 bs=1m
dd if=$SOURCE of=/dev/rdisk4 bs=1m
dd if=$SOURCE of=/dev/rdisk5 bs=1m
dd if=$SOURCE of=/dev/rdisk6 bs=1m
dd if=$SOURCE of=/dev/rdisk7 bs=1m

osascript -e 'display notification "Drives complete" with title "Complete!"'

Make the file executable (once):

chmod +x ~/Desktop/script.sh

Run it with administrative privileges:

sudo ~/Desktop/script.sh

MacOS – Can’t reformat SD card (Yosemite)

Get drive name

diskutil list

then try

diskutil unmountDisk force /dev/DRIVENAME

Then format

diskutil eraseDisk JHFS+ Emptied /dev/DRIVENAME

Best Answer

Related Solutions

How to create an applescript for multiple dd terminal commands in sequence (for multiple USB Drives duplication)

MacOS – Can’t reformat SD card (Yosemite)

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