thing is, the disk was working fine (HDD)
had no reason to suspect anything wrong (guess that is how it usually starts), so have no idea of health status via Sentinel
did a fresh Windows install on an nvme and a few days later get the Windows msg saying a drive needs to be Scan and Repair so like a numpty, clicked it
(had a previous instance or 2 where I got the same msg, clicked it and within like seconds it was finished which is why I clicked it without thinking)
didn't run any commands initially as it was that 'integrated' Windows repair you get when you ie put PC on and it goes to mobo logo with the repair being done in big letters
it is probably chkdsk as I then did try it in Windows but didn't know which to use, /f or /r
I could still see the drive in Windows after I did the cancel, but I think it would have probably hung if I tried to access some of the files so didn't want to risk it
I can try and do the repair via USB with an external hub, but again the issue that comes up is the dreading load shedding and the increasing ETA timer ;(