[Windows 10 - non system drive] BIOS runs disk check with every boot, SMART and disk properties say disks are all healthy, but chkdsk fails while repairing security descriptors.

I recently did some cable management in my case. After turning my PC back on, windows has started taking much longer to boot, and while the BIOS splash screen is displayed, it starts checking my secondary storage drive. It does this with every single boot now. Everything seems to work fine though

I have run `wmic diskdrive get status`, which lists all drives as "OK"

I have checked the device properties of the offending drive, which shows that it is working properly, but using the error checking tool in the properties window, it finds errors which it then fails to repair with the error

Repairing the security file record segment. Write failure with status 0xc0000185 at offset 0x1454829000 for 0x17000 bytes. Readable file record segment 9 is not writeable. Write failure with status 0xc0000185 at offset 0x1454840000 for 0x20000 bytes. An unspecified error occurred (6e74667363686b2e 1798).

I have also run both `chkdsk /r X:` and `chkdsk /f X:` again manually from poweshell, and hit the same problem when trying `chkdsk /r X:` and an unspecified error with no further description:

Stage 3: Examining security descriptors ... An unspecified error occurred (736463686b2e6378 ad7). An unspecified error occurred (6e74667363686b2e 1798).

As I understand it, this doesn't indicate any physical problem with the hardware, but that something has gone wrong with some security records?

The drive only contains backed up files and programs that can be re-installed, but I'd rather not have to if it can be avoided because it has over 800Gb of files so that would be a lot of work...

Advice is apreciated.