What type of ext disk to use as scratch disk ?

Hi,
I've been searching this part of the discussions all day to find out what type (USB2.0/FW400/FW800) of external disk to use for FCP as a scratch disk. No luck yet. I've also checked the docs on this, but I couldn't find anything.
Did a Google search. Found all sorts of different setups people are using. No consistency.
I need some help on this.

No to USB...
#43 - USB vs Firewire vs...
Shane's Stock Answer #43 - Types of hard drives and how they compare when working with video
Drive types and how good they are when it comes to dealing with video...
USB 2 = BAD
Firewire = GOOD
e-SATA = more GOOD
Internal SATA = more better GOOD
eSATA RAID = more MORE better GOOD
4 gig FIbre = Just about the best you can get! (great for SAN networks)
External PCIe = Da Bomb! 5 times faster than Fibre
Shane

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