FireFly Media Server will index all of your files in the folder you specified. This may take a while, and it will not be available properly until it is done. Also, when FireFly Media Server tries indexing corrupt files, it crashes. Here’s the method from the MS WHS Forums:

What you will need

• Remote Desktop Connection or Advanced Admin Console
• Bonjour - Yes, this is in fact required.
• Firefly Media Server - The most current version is build 1696, and does work on Windows Home Server
• Firefly WHS Add-In - Download this to your “Add-Ins” directory on the server.

1. Once you are at the console, use notepad to edit “c:\program files\firefly media server\mt-daapd.conf”
2. Change (or add, if it isn’t there) an option called “debuglevel” with a value of 5 in the “[general]“ section.
3. Then, delete the “songs3.db” file (in “c:\program files\firefly media server”) and start the firefly server.
4. It will crank around, indexing the music for a while. At some point it will crash. When it does, look at the log file in “c:\program files\firefly media server\firefly.log”.

Find the last song it tried to index and move it out of the way. Then start it again and repeat as necessary.

Source:→ WGS