Premiere and Raid 0

Question

Hi Everybody,
As i know that Adobe says that premiere will work in a more efficient way with two hard drive (one for the system and one for the rushes) I would like to have your help on this point:
I am going to work on a new laptop (with premiere pro cs3) that contains two hard drive (it is one of my criteria for this purchase) and the system allow me to put them in Raid 0. Those hdd run at 5400 t/m (unfortunately it is very difficult to find laptop with hdd at 7200t/m or they are too much expensive).
So do you think it is better to let work premiere with two "slow" hdd (one for system, one for rush) or to put them in Raid 0 for that the system will consider them as only one hdd, as I have understood so far, but that will be more fast (in pratical 1,5 faster if I have well understood, because the system write a file in the same time on the two hdd, one part on each of them) ?
To resume my question, do you think it is better to have 2 "slow" hdd or one faster hdd to make premiere work more efficiently ?
I thank you in advance for your kind help for a newbie,
Videocol.

Answer 1

Hi again,
Thanks so much to Harm, Jim and Steven for their fast answer, interest in my question and their precious comment. I understand perfectly the solution you're talking about but maybe I should precise my question.
In fact the security of my data is not a problem in this situation, because i have a desktop pc (at my work in a school) where i mainly develop my project and all the data are well secured (as well as it could be :-) with 2 internal hdd 7200 t/m plus daily backup of the rushes and works on differents external hdd keeped in different places (at work and at home, in case fire make burn one of this place !).
On my laptop (just for home), I just want to make little project or finish a part of the work done at work. I know the problem with loosing data on the 2 disks in the same time with raid 0 indicated by Harm, but as i said this is not a problem because the data are well saved at work (and even at home) because I make often backup on different external hdd. And if ever I loose a few hours of work on the laptop, and it has already happen believe me ! OK, that's life ! I just have to do this little work again. But with the other copy I have, I don't loose too much. So I really can handle this problem of security and I have really thought to it (especially after loosing some important editing work in the past years, I have decided to take this problem seriously).
My problem is that I'm not looking for a professional editing tool on my laptop (It is just a part of what I do with) and I want to let it the more mobile possible: edit in the garden with the birds inspiring me, explaining some AE tricks in a friend's home... So I precisely don't want to work with an external hdd. I wish that all my data stay on my internal hdd to be independent and take my laptop where I go with nothing more to carry with it. That's why I buy a 2 internal hdd laptop. To give you a stupid example, I often edit on the sofa (it's more confortable :-) with the laptop on the top of my lap (i'm a little bit lazy as you might have understood :-). In this case it is really not handy to have an external hdd attached to the laptop. Even my mouse is bluetooth to tell you I really hate all those horrible cables I have at work (it's why I work with a laptop at home).
So in those conditions, even if they are not the best way to work in a professional and secure manner, and if I really prefer to work only with the 2 internal hdd of my laptop, do you think it is better to let them independent with one for system and one for rushes, or to put them on raid0 for that they will be seen as one hdd but more fast. In which case do you think premiere will works more fastly and efficiently ?
I apologize for the length of my question, and thanks again I you had the courage to read it all. And also sorry for my bad english, i'm only a little frenchy :-).
Videocol.