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Sorry for the long delay, but I gave the disk to a local disk recovery place, and they wouldn't tell me what tool they used, but they recovered a lot of the files (don't know what % but a lot of them) including their file names. They didn't write the disk at all. They said the disk had lots of bad ...

I tried that (to the 'List' item) and it still says" "Can't open filesystem. Filesystem seems damaged."

Is there some way I can go in there manually and fix the bytes-per-sector problem?

What's strange is that one tool out there (GetDataBack) can recover the structure of the directories but not ...

Is there something I can do manually to change the bytes per sector mismatch?
It doesn't look like the steps you suggested seemed to do that unless I followed them incorrectly.
Any help would be appreciated.
TIA!

I think I did what you suggested, here are my notes from what I tried. However it still says bytes per sector mismatch. Shouldn't that warning go away? Did I not follow your instructions correctly?
TIA!

TestDisk:
Selected PhysicalDrive1 | proceed
Selected Intel partition
Selected Analyze | Quick ...

Sorry, I didn't understand the distinction between Phys drive and logical drive.
Below I've posted the log resulting from the physical drive.

I tried running the GetDataBack tool (evaluation) and I get what looks like a
significant portion of the file tree structure and filenames look correct, but ...

My 1TB NTFS drive (not the boot disk) all of a sudden is inaccessible, wIndows wants to format it.

I ran testdisk on it and the partition seems OK, but the filesystem is gone:
Drive E: - 1000 GB / 931 GiB - CHS 15200 255 63
Partition Start End Size in sectors
> HPFS - NTFS 0 4 5 15200 35 3 ...