Got home from a wedding tonight, transferred all photos to the computer and then (quickly) checked the photos.
Few photos were corrupt when I first reached them but other photos I saw, or saw the thumbs of, became corrupt afterwards. I'm not sure how, why or exactly when. The photos are fine on the cards and have been copied successfully over again.
I use Photo Mechanic for this kind of viewing and proofing. Been using it for some years without any issue.
I also have a, supposedly, good disk monitoring program running permanently in the background and it reports no issues with the disks.
I cant reproduce the issue, so I cant dig deeper into this. The only recent changes to my system I can think of, are Windows updates.
What could be causing this?