Could this be confirmed via S.M.A.R.T. attributes?
I came across this post while searching for answers to an odd situation I had the other day. I swapped out a bad drive and filled its replacement with several TB of data; everything was looking good at this point. However, the next day, I was having some power issues and my machine rebooted multiple times in quick succession. Following this, Scanner reported unreadable sectors on the new drive. But, after marking those sectors as unchecked, Scanner reported them as good once it scanned them again. This has me worried that I ended up with a defective drive.