Constant Disk Activity with Mac mini

Hi,
I have a current model mac mini 2.5Ghz (with a few upgrades) that is having a weird issue.
I seem to be getting what appears to be almost constant hard disk activity/noise?
As i'm typing this i can hear a constant thrumming fom what appears to be the hard disk.
The spec is:
2.5Ghz i5
8gb of ram
Apple shipped 750gb 7200rpm HD
Apple shipped 500gb 5400rpm HD
The activity is pretty much constant afer waking from sleep or booting and last for ages.
I have external hard drives connected but as yet have not set up or turned on time machine so i cvan't believe it's that?
Any help please?
Thanks.

Hi, Took some screen graps, all this info means nothing to me though! lol

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Constant Disk Activity with Mac mini

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