What does SMART Attribute ID 187 (UECC Count) actually mean for real world data integrity?

[Mark_166]

Hello everyone,

So I have the Sandisk Extreme Pro 960GB SSD. It's had a grand total of 1.7 TB of data written to it over the course of about a year. Yesterday I decided to check on the SMART data and I noticed that the UECC count (ID 187) was 9 (raw data). So I ran a short and extended SMART test. Both passed. I ran a bad sector check as well. None to speak of. HOWEVER, I noticed that the UECC count incremented by 1 during the sector check. So I ran it again. And again, it incremented by 1. Each bad sector check puts the read data count up by 1TB, so for each TB read the UECC count increments by 1. This leads me to believe there is exactly 1 bad ECC module in the drive. My question:

What does this actually represent? Doing a few hours of Google research I understand what ECC is and what an Uncorrectable ECC means, BUT what does it REPRESENT? Will the disk fail? Will there be corrupted data? And if so will it only be on that one sector with bad ECC?

My wife also has the exact same drive and her UECC Count is 7 currently (again, a year of usage about). Hers also has 1 Reallocated sector. Hers is a boot drive and mine is just a storage drive. Here is an image of the SMART attributes from my drive from Sandisk Dashboard:

Note, all other attributes are A-OK. Thank you in advance for the help!!!

EDIT: Here is the CrystalDiskInfo as well:

 

[Boogieman_WD]

Hey there, Mark_116.

I'd say that there's nothing serious you should be worried about. It seem like the drive is passing the tests of both utilities with everything in the threshold. However, no matter how reliable a drive might be, that does not excuse you from having a backup of your most important files. Keep that in mind and check the drive from time to time, to see if there's a sudden rise of those errors. I think should be good for now.

Hope that helps.
Boogieman_WD