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?