Hddb is a portable MFT-based search tool for NTFS drives, which means it's extremely fast at locating file names, but it can't search for content.
The developer says that "Hddb was built in imitation of Everything" (another popular MFT-based search utility), and the program does look and feel very similar. There's a simple window with a search box at the top; start to enter your target file name, and matches appear and are updated almost as quickly as you can type.
Once you spot a target file, you can launch it with a quick double-click, or right-click to see the usual Explorer context menu.
And there's also a File > Export option to save the list of matching files to a plain text report.
Hddb has a few potential advantages over Everything.
It doesn't require administrative rights when searching, so you won't see as many UAC prompts.
The program can be much faster when sorting by date or size.
It doesn't rebuild its database automatically, either. Some people may see this as a problem, but it does mean you won't be kept waiting on launch occasionally while the database is updated.
Hddb is also a little slower when searching - though probably not enough to matter - and much simpler. There are no search tweaks here ("Match Case", "Match Whole Word"), no regular expression support. It doesn't include any server options, and isn't available in a portable option.
Still, Hddb's faster file sorting is welcome, and if you're annoyed by Everything's UAC prompts and prefer the manual database rebuilds then it might be worth a try.
v2.1.4 is a bug fix release.