Sonar reports file change activity on your hard drive by showing you a short message every time a program changes a file on your hard drive.

Sonar can be useful for several purposes:
· Run Sonar before installing a new program so you can see exactly what gets installed. Then you can remove it later if necessary.
· Use Sonar to troubleshoot Spotlight-related slowdowns on your computer. Sonar will show you highly active files that you might want to consider adding to the Spotlight exclusion list to avoid frequent re-indexing.
· Developers can use Sonar to monitor how frequently their software writes to the hard drive. Developers can use this information to optimize their program's hard drive usage.

Sonar reports file system activity and it reports all the changes. Sonar does not report reading activity. Sonar cannot prevent disk activity. It only can report it.

However, you can use the information reported by Sonar to delete files you don't want on your hard drive.

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