High raw read error rate

[Harry Potter]

Hello all. My pc was having frequent blue dump
Error last week. So repair person has reset the system drive and did chkdsk scan and fixing. After that pc was ok for two days. And health was 76%. After two days again blue dump error came with error message “kernel security check failure”. And after restart health of disk reduce to 75%, weak sector increased to 10 from 9 and raw read error rate has also increased to 7714 from 7678. After that now blue dump error has not come again but raw read error rate is increasing almost every day. I don’t understand the reason. Kindly suggest some solution. And explain what does increase in raw read error rate means. I am attaching that graph also.
Thanks In advance.

[hdsentinel]

Please check the suggested link in the text description:

https://www.hdsentinel.com/hard_disk_ca ... ectors.php

which describes generally what are these weak sectors, how they appear, how they could be fixed and repaired - and they could be avoided in general.

Such issues are usually not related to the hard disk drive, but caused by something else: for example connections, cables, power source, overclock, sudden power loss/power failure and so (as described on this page).

Yes, what you wrote is completely "normal" and expected: these pending/weak sectors very frequently cause unreadable files/folders and can lead to boot problems (Windows can't start at all) or "just" such weird error messages/crashes - and may result that the raw read error rate is increasing on some of the drives.

But the problem is generally not the "raw read error rate" itself but the "current pending sector count" which is reported in the text description.

Your repair person would need to address/fix these issues related to cables/connections etc. before (or instead of ...) chkdsk. As described on the link too, chkdsk does not help, does not fix such problems.
Instead, after fixing the cables, connections, you'd need to use Disk menu -> Surface test -> Disk Repair function in Hard Disk Sentinel, ideally then the problems will be fixed and the health may increase too.

[Harry Potter]

Thanks for your informative reply. It helped me to understand. As during this lockdown No service centres are operable. All repair person are helping to solve problem through Remote Desktop.
So it is not possible for to get it check perfectly. But I understood that Reinitialise disk surface test could help to restore the health. Is this test destructive ??

[hdsentinel]

Yes, the Reinitialise disk surface test is destructive, it will clear all data, so should be used only after backup of all data.
Because of its nature, it is not possible to start on a system drive, so it would be required to remove the drive from the PC, connect it to a different PC by USB dock/enclosure and perform the test this way to make it clean and fresh.
So this may be not possible for now until the PC could be checked in the service center....