check for corrupted files

Other than chkdsk, What program can interactively check if NTFS files are corrupted (either written corrupt files or files which became corrupted after their original write)

If such a program exists, does it need to first checksum every file on the drive to have a "known-good" reference table?

Does NTFS keep checksum information for every file by default?

Is there a way to check files for corruption without knowing their original checksum?

>>3
cant checksums be kept in ntfs alternate data streams
You can, but no tool that I know does that

how long can it really take to write a checksum as each new file is written to disk
The problem is you not only have to create it for every file, you have to keep it updated on every change, and to check your disk for sanity, you need to read every frigging file.