Issue with SD card format - won't unmount Below is the 2 screenshot that I have tried after searching on so many places on net, but nothing worked for me until now.

First one is via using DiskUtil :



And second one via terminal :



Both the method is having issue and unable to format the sdcard, could anybody please help this out.

Highly appreciated your help in advance thanks.

Update the current snapshot of the memory card from disk utility :
I had a reluctant SD Card that reported "Resource Busy" whenever I tried to dd an image onto it even after unmounting it. My fix was to use the "Force" option for the diskutil unmount command:

diskutil unmountDisk force /dev/disk&lt;# of the drive you want to unmount&gt;