Originally Posted By: artie505
I'd try again after changing "rdisk1" to "disk1," and if that's still a no-go, we may need some input from V1 (who originally posted the command).

Still a no-go. The result I got, after entering my password, was the same:

Last login: Wed May 15 11:49:50 on ttys000
iMac:~ myname$ sudo dd if=/dev/disk1 of=/dev/null conv=noerror bs=1024000
Password:
dd: /dev/disk1: Operation not permitted
iMac:~ myname$

Last edited by ryck; 05/15/19 05:53 PM.
ryck

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