How to stop external USB HD from unmounting?

I have an external harddisk (a Samsung 400GB drive with one FAT32 and one HFS+ partition in a Mapower MAP-AL31-US case) which normally does what it should. The drive is connected via a powered USB hub.
However, when the drive has not been accessed for circa fifteen minutes, it will unmount/"eject" - even when the Mac itself does not go to Standby mode. The result is a warning and a lengthy check once the volume is "re-discovered"/mounted by Mac OS. I had no data loss so far, but I really would like to stop this.
Can someone tell me if (and where) this behavior can be changed from OS X, or is this a low-level HD/HD controller issue?
I used to know how to fix such problems, but obviously this is the kind of know-how you forget when you don't need it for years ...
Thanks in advance.

Hello Zlig,
thank you. I'll uncheck - as you suggested - "Put the hard disk(s) to sleep when possible" and see if this helps.
But (this may be a dumb question) doesn't this also mean that when the MacBook goes to sleep (e.g. when I close the display or when the "Sleep" time has been reached) that the machine's internal drive will not be put to sleep either and keep on spinning? I certainly wouldn't want this when I carry the machine around ...

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