Re: 2013 21.5" iMac, running Catalina
The T5 'used' to work fine until a few days ago. Now it shows only 44 MB (total space).
When using Disk Utility to Erase, it Fails.
How can I get this T5 back to function as a 500 GB SSD unit?
You need to unlock it. When the T5 is locked it will only show a small read-only partition. This is to allow you to easily install utilities provided by Samsung. Once you unlock it, you will see the entire disk.