What process write on my SSD constantly (more than 800MB) ?

Looking in Activity Monitor under Disk tab, I can see what applications write to disk and how much MB.
But, at the bottom the total shown is much greater than what all apps combined write. So I want to know which process writes all that extra ? I found that it is mds_stores, so I will google it..

I have to mention that:
- I disabled Computer to sleep in Power saving preferences
- I have installed Chameleon SSD optimiser and disabled hibernation/sleep image.
- Also I got rid of the swap file, I don't remember how I disabled that

 

800MB in a period of less than one hour from the moment I started the system.
I don't know how much it accumulates until the end of the day but I will check.. Is it just me that thinks its too much writing ?

 

Thanks a lot for suggestions,

I have not booted into single mode, as that required to do some more research,
but I disabled Spotlight and that solved the problem with mds.

Meanwhile I managed to render Terminal not to start by changing some file permissions, as I wanted to look where written files are located, the biggest file written is snapshots.db now not needed anymore..