Thunderbolt SSD as booting drive

I recently bought an external Thunderbolt SSD from LaCie* for my Mid-2011 iMac to use it as my boot drive (Mountain Lion).
Now my problem is that after the Apple starting sound it often takes a lot of time (sometimes up to one minute) until the apple and the spinning wheel appear. After that booting time is just fine.
Does anybody know how to get the iMac recognize the SSD with the start volume faster (in the system preferences the SSD is set as the start volume)?
Many thanks!
* http://www.amazon.com/LaCie-Rugged-Thunderbolt-Series-9000291/dp/B00A3G461K/ref= sr_1_1?ie=UTF8&qid=1377610105&sr=8-1&keywords=lacie+ssd

Try resetting the PRAM on the system by rebooting and holding the Option-Command-P-R keys immediately when you hear the boot chimes. Hold them until the system resets and sounds the boot chimes again, and then release them and allow it to boot normally. Then use the system preferences to again set the external drive as the boot drive.

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