OSX freezes while external HDD starts up.

I have a WD My Book Studio connected to my Mac via firewire 800.
Over time the HDD goes into a sleep mode.
When using OSX, the HDD randomly starts up.
I have had it start up when simply using the brush tool in Photoshop to surfing the net.
For the duration of the boot OSX freezes up, it can take anything from 5-15 seconds.
It isn't to much of a problem, however if there is a way to prevent this from happening. It would be good to know.

I have disabled the "Put the hard disk(s) to sleep when possible" in System Preferences -> Energy Saver.
It however did not affect the external HDD.
As for un-mounting the drive and remounting it. I know that works, however it is haste. I'm not sure if there is a solution for this. Do Seagate HDDs have the same problem ?
Also out of interest, what HHDs do LaCie use, do they make their own drives?

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
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Mac osx freezes right after start up and all desktop files disappeared and the mouse can't click on anything..help?, Mac osx freezes right after start up and all desktop files disappeared and the mouse can't click on anything..help?

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OSX freezes while external HDD starts up.

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