Hard Drive writing Issue.

Hi,
I'm not sure if I'm in the correct forum, but I'm hoping someone can help.
I think I've pinpointed the reason why my IMac is slowing.
When i download large files, or record a movie through my iSight camera, i noticed in both situations, that the data seems to be written to the disk in a very intermittent way.
The Activity monitor does not show high levels of CPU usage, but the disk activity maxes out every few seconds. Data is written in spurts. Virtual memory is half of my capacity, and pageouts are low.
The resulting movie file is choppy, start and stop, with pieces missing that did not get written to the disk.
When downloading Torrents, the torrent client freezes until the hard drive catches up (it seems).
I have already cleaned the preference files, and caches with Applejack, and also Onyx.
Does anyone have any insight?

Torrents are by and large illegal. They give you buggy, untested software that can cause data corruption and other issues. Furthermore, torrent software makes your machine into an internet file server, which in turn slows down your traffic. Stop using it, and get software from legitimate sources such as http://www.macupdate.com/ and http://www.versiontracker.com/

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