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I have a micro SD card that has noobs for raspberry pi. I want to install ubuntu to it and to do so need to format the SD card.

In Disk Utility i went to erase it and it said

Unmounting disk
POSIX reports: The operation couldn’t be completed. Invalid argument.
Operation failed…

it unmounted both disks disk3s1 and disk3s6 and I cannot remount them. these disks are on the micro SD card as noobs installs a boot and restore to the sd card Disk Utility screenshot

thanks in advance guys :)

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