This file integrity checker uses Alternate Data Streams to store the hashes of your files. So, it only works on NTFS volumes.
With that, you can rename, copy or move your files (to another NTFS volume) without losing the hashes, and without needing to do anything else.
The Whirlpool algorithm is a strong 512-bit hash function. This tool uses an optimized implementation for 64-bit and SSE4.1 (in 64-bit) or SSE2 (in 32-bit) when available.
Each folder is recursively processed. You can use drag-and-drop, mix files and folders, pause and resume.
Minimum requirement: Windows XP or later.
Solid. Small. Ingenious. I like it. Keeps track of the things which are important and difficult to manage.