Is there a defragging program out?

[SPEEDBUTCHER]

Okay lets say you liked game A but wanted more room for a new game you bought like game B so you ftp a backup and it was one of the first games you put on the drive leaving a hole so i just wondered if anyone has made a defrag program for the xbox hd?
And for that matter virus protection from viruses etc getting on the drive so if you ftp to the xbox that virus you just got rid of keeps coming back just a thought so before someone makes a virus spacific to the xbox we have a defense against it.