I have the same FAILED notification for my Samsung SM951 (AHCI) 128GB, reported in Linux as
SAMSUNG MZHPV128HDGM-00000 (BXW2500Q).
But in my case, I think it's a firmware bug of the drive because the
total-bytes-written property is reported as 1.1TB while the drive has a specified Total Bytes Written (TBW) of 75TB! Which probably is on the very save side, because similar (MLC NAND) drives all reached a multitude of that (600TB) in a real endurance test. And apart from the
wear_level_count warning no other prefail or old age errors or warnings are reported, while the
reallocated-sector-count, which according to that test is a good pre-fail indicator, is still 0.
So my advise would be to examine those values for your drive/system and base your conclusions on that.
I prefer the low-level utility
skdump which is supplied with
libatasmart, the same library that is used by Gnome Disks.
Use the following command, replacing
/dev/sdc with the path to your block device:
sudo skdump /dev/sdc