Hard drive formatting: error message -69760 I can't access my TOSHIBA External USB 3.0 Media external hard drive. Now I'm trying to format it but I get this error message:

Erasing &quot;TOSHIBA External USB 3.0 Media&quot; (disk3) and creating &quot;Untitled&quot;
Unmounting disk
Creating the partition map
Unable to write to the last block of the device.: (-69760)
The operation failed ...

How can I resolve this issue?
I've run across this a few times before and there were two approaches that worked:


Format the drive in a Windows machine (FAT32 or NTFS is fine)
Zero out the drive.  This, in effect, writes zeros on every single datablock on your hard/solid disk drive.  

% sudo dd if=/dev/zero of=/dev/diskN bs=8m     ← Where diskN is your disk identifier



The idea is to write each block with a zero overwriting whatever was there corrupting it.  Keep in mind, this will take a long, long time so if you have a Windows machine handy, it makes sense to first format it there then try again in macOS.