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I've tried pretty much everything I can find in TestDisk... I fixed the Boot Sector, repaired the MFT, and rewrote the partition table. A Ubuntu LiveCD can locate and identify the partition with no trouble, but Windows still thinks it's RAW. What do I do next?

So it's because you problem isn't partition table but else bootector, else MFT.

In "Advanced" may you please report the status of the BS you have ?
The BS initially gave me a warning: Incorrect number of heads/cylinder 16 (NTFS) != 255 (HD) . I did a repair on that from TestDisk, and now it ...

I did. In fact, I even went so far as to boot my system from a Linux LiveCD and run TestDisk from there as root. Windows still refuses to believe the partition is anything but RAW.

An NTFS partiton on one of my hard drives (data only, not bootable) got corrupted somehow, and my system (Win7 x64) can't mount it anymore. The Disk Management tool displays it as RAW.

I ran TestDisk, and it was able to correctly identify the partition as NTFS. I was able to look and confirm that ...