Unrecoverable sector errors. What does this mean?

Question

Hard disks

What does this SMART indicator mean - sectors that could not be reassigned (for example, due to the fact that the spare area ended), or sectors that are candidates for reassignment?

Answer 1

this is the number of sectors that the disk once considered corrupted. Each time before writing to such a sector, the disk checks this sector for stability and, depending on its state, either replaces it with a spare one or marks it as broken. A non-zero value of the parameter indicates problems on the disk. The disk receives this data in self-test mode in idle mode.

Answer 2

This means that a scribe is digging a mink on the disk and we should think about where to copy the data :)

Answer 3

So the disk can soon be thrown out

Answer 4

SMART indicator - sectors that could not be reassigned

Specify, please, the name of the attribute in English, or its ID (Number).
Do you mean attribute 198 (C6) Offline Uncorrectable Sector Count (Uncorrectable Sector Count) ?
It contains the number of candidate remapping sectors found during offline testing that the drive starts up during idle time according to firmware dependent parameters.

sectors - candidates for reassignment?

197 (C5) Current Pending Sector Count - are you talking about him?
This is the number of candidate sectors for reassignment to the reserve area.
Those. the number of sectors that the disk encountered in the process of operation, and which it “did not like”. First, this sector is marked as a candidate for reassignment and entered into the appropriate internal list (at this point parameter 197 / C5 is incremented).
Subsequently, this sector can be either removed from the list (with a decrease in the parameter) or reassigned, while attribute 197 will also decrease, but attributes 196 (С4) Reallocated Event Count and 05 Reallocated Sector Count will increase , corresponding marks will also be made in G- list.
-PS-
If everything in your program is in Russian, you can see the original names of the SMART parameters in R.tester .
It also has an automatic diagnostic function that interprets parameters and displays possible hard drive problems.
PPS
In any case, if you doubt the health of the HDD, start by copying important data to another drive, this is more important than any hard drive checks. Then it may be too late.
Also, in any case, do not try to "treat" the disk with partitions like HDD Regenerator.

Answer 5

Detailed guide to SMART attributes:
https://www.ixbt.com/storage/hdd-smart-testing.shtml