Ursprünglicher Beitrag von: Ayman Abdelkafy ,
Disk erase failed "Couldn't open device"
I bought a new SSD “Crucial MX500 2 TB“ to update my iMac 21.5 inch late 2012, so first i connected it using external SATA cable with USB 3.0 and tried to format it to be able to clone my old drive to my new SSD but the operation of erasing has failed and i get the message of "Couldn't open device" , i tried to change the format and also tried another MacBook air and even used terminal to do it but nothing ever succeeded in erasing the SSD. ANY Suggestions Please?
iMac Intel 21.5" EMC 2544