Unable to erase items off my SSD error code -43
My WD SSD - will not delete files from the hard drive
Doncaster East
[Re-Titled by Moderator]
Your Late 2009 iMac can be updated to macOS10.13 High Sierra, which can better handle the files structures used on SSDs.
How to download and install macOS - Apple Support
I have asked the moderators to remove your image because it reveals your serial number—a potential security risk. This it with the serial number cut hidden: