Lightroom constantly accessing disks

I have noticed very recently that LR is constantly accessing all my disks, even ones I am not working on at all.

I've checked performance monitoring and can see it constantly accessing all disks.

I can watch it in resource manager accessing image files I haven't touched in ages so am at a loss as to what it is doing. The only thing I can think of is auto tidying previews, but as I say, many of the files I can see it is 'dipping in to' haven't been touched for months (or longer!), particularly on the external drive.

What is going on and is it to be expected as it is clearly an overhead on my system and disks?

NOTE - I have recently (a week ago and have had LR running every day since) installed new disks (an SSD and HDD) and reorganised my files across HDD disks although the external one remains as it was, just a different drive letter (drive C,D,J,L etc) - obviously I have had to redirct LR Library to the new drive letters .... could this be a cause and if so why and will it stop?

LR Classic  V.7.2 [ 1156743 ]