Logic behind HDD error LED on QUAD SATA hat

Hey guys,
I just installed my four HDD on the quad SATA hat which is placed on a Raspberry Pi 4. For one of the drives the error LED remains on all the time but non of the smart scans reveils any error. What is the logic behind the error LED on the QUAD SATA hat? Is it possible that the error LED shows a false error?

The HDD that shows this behaviour is of a different type than the others hard drives that I have installed. I hope you guys can help me with that.


Are all the error lights on? Does reading and writing make mistakes?