Qmaterd - What is it?. How do you stop it?

Every time I start my Mac a process starts in the background: qmasterd, with command: /usr/sbin/qmasterd -child.
This process keeps busy the hard drive all the time with a mysterious write process. I can't see that the activity fills the hard drive with data but is annoying and unnecessary process as far I can see.
The only way to stop the process is to kill it in Activity Monitor, but it will restart next boot.
I'm not using Qmaster for sharing services and I reset Compressor and Batch Monitor, they has no visible queue.
Any idea how you control this process and what is it?

You need it running in order to use Compressor. Compressor will not work without it.
However, you can should be able to prevent it from launching at startup by moving the /Library/StartupItems/Qmaster folder to a different directory and then launching qmasterd on demand by typing "Qmaster -start" in the Terminal.

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