It sounds to me like there is an error on the drive. If it ran for 30hrs on chksdk with no results then I would write it off and get a new drive, they are cheap enough these days. I have had similar experiences with exfat and now just use ntfs, exfat seems to be very flaky. If you have data you consider valuable, you need to consider just how much of your productive time you can realistically put into recovery attempts. There are commercial companies that specialise in data recovery, they are very, very expensive. So you need to weigh up the cost not just in monetary terms but also in terms of your own life and how many hours of your life you are willing to devote to most likely fruitless recovery attempts. You will never get those hours back! Maybe you can re-create the data from scratch if you still have the source material. I’ve been there and done that! Backup,backup backup!
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