Why would my disk need repair?

[mopppish]

Hi, all.
I've been doing a lot of audio recording lately on my MBP. It seemed to be acting a little funny the past day or two (little hiccups in the audio programs) so I decided to run some routine maintenance today. Onyx, repair permissions, etc. Well, Onyx told me that my disk needed repair! When I rebooted from my OSX disks and ran disk utility, it said "volume header needs minor repair".
The repair apparently was successful, but why might this have happened? Is there anything I can do to prevent this in the future?
Thanks!

 

[emptyCup]

The repair apparently was successful, but why might this have happened? Is there anything I can do to prevent this in the future?
Thanks!

The are many reasons this can happen. Weird interactions that can never be found because they can't be reproduced. Transient power fluctuations that corrupt information in memory which eventually gets written back to disk.

Most of this can be eliminated by restarting every so often. I do a restart and disk check every week before I back up.