raid using an internal and external drive?

[excalibur313]

I have an g5 imac with a 75gb hard drive and I just bought a 250gb external drive. Can I do a hardware or software raid 0 to get the increased performance or would the performance be minimal since it is only usb2? Even if it wouldn't offer too much of a boost I think I would still want to do it because it would make things easier than having to deal with two separate hard drives. How can I do this and will I have to format my internal drive? I have panther.
Thanks,
Stephen

EDIT: After looking around it seems like that striping two drives of different sizes is a bad idea because the total hard drive would only be 150gb and the extra 175gb would be wasted on the external. Is this true and if it is can I do a jabod setup (just a bunch of disks?) or is that more of a windows thing?

One more thing: The main reason why I'm doing this is to have a place to store my photos, videos, and music. Is there an easy way to do this so I can still look at them with iphoto, itunes etc? Said differently, can I specify the path that the program looks to find this stuff?

 

[CanadaRAM]

You could do a RAID, but it won't improve your performance much, if at all, an may make it worse, USB is a bad interface for mass storage in the first place, and your risk of catastrophic failure is magnificently higher with a RAID 0.

You would have to format both drives, therefore lose all data.

If you think that having to deal with two separate drives is a hassle, then you do NOT want to take on a RAID system.

Seriously; it was an original idea, credit for thinking of it.
But it is not practical, best to abandon this approach.

Go have some egg nog.
Cheers!

 

[excalibur313]

What do you think the best way of doing the last thing I mentioned is? Is there some way, maybe through shortcut references, to move stuff to the external drive?