Formatting a MicroSD card within OSX

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I am trying to format a 32GB MicroSD card using the Disk Utilities app in OSX

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however I am receiving this error: enter image description here

I need that for processing with this manual.

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Mona Jalal On BEST ANSWER

Firstly write this command in the terminal:

diskutil list

Then it will show a list of disks. Find the one which caused the problem and use this command for it:

sudo diskutil unmountDisk /dev/disk4

Now it should be erased successfully if you get back to the Disk Utilities program.