Best External Scratch Disk for iMac?

I'm a new Mac user and i'm now using my iMac as my primary computer. I've been looking online to find out which approach is best when using adobe products that require scratch disks. Should i use external USB or Firewire interface? What I've done for my windows system in the past is I purchased a 10,000rpm hard drive and dedicated it as a scratch disk and installed it internally. If I do this with either USB or firewire, my big plan is I would go and get a 10krpm hard drive and by an enclosure with usb and firewire. Anyone know how I should approach this on an iMac and will my plan work?
Thanks!

You could go with an external Firewire 800 disk and a 7200 or faster drive. But that won’t be as fast as your iMac’s internal drive which is SATA II 3Gbps. You could partition the internal drive so that you have one ‘work’ drive to be used for video/graphics scratch files. At least I did that. Bit of work ahead of you though since your internal drive currently is likely just one big partition. Post back your conclusions.

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