I experienced this issue the other day when trying to create a bootable installer for my iMac from 2009.
How to upgrade your 27 inch 2019 Intel iMac
For those of you wanting to upgrade your iMac without having to remove the screen (like myself ) I have tried and tested the method below and my iMac has had new lease of life. I didn’t want to change it because I love the 27inch screen and wish I
The error code "-69888, 0" indicates an issue that occurred while erasing a disk. This error typically happens when the disk you're trying to erase is:
- Write-protected: The disk might have a physical write-protection switch, or software settings preventing data changes.
- In use by another process: Another application or background process might be using the disk, preventing the erase operation.
If you get Error erasing disk error number (-69888, 0) A error occurred erasing the disk. message when trying to create a bootable USB, make sure the USB drive is not currently used by the system or your apps.
Have a think and check what apps are currently open and then close them. (Finder windows or current directory in Terminal).
Once they are closed the error should disappear.