"Disk Not Eject Properly" means there are errors in your operating system, on the connected external removable drives, or in the connections between your external drives and the Mac.
There are some reasons that may cause Disk Not Eject Properly.
- Errors in the operating system
- Problems with the removable hard drive
- Failing external drive cable
- The USB or other ports on the Mac computer are defective
This error occurred after you updated your operating system to macOS Ventura, so there's maybe some errors in the operating system, but you can still take the following ways to troubleshoot.
After that, you can check whether the error message still pops up.