What to use for scratch disk?

I'll be getting a new mac in the coming year, probably either macbook pro or imac. In either case, I'll have a single internal hard drive. I know that I want to get more into Final Cut Express, and am trying to think ahead for my scratch drive purposes.
It seems to me that I will need a fast external disk drive, and that there are two ways to accomplish this. Either through an eSATA connection, or through a RAID product (or both!), so here are my questions:
1. Should I be more interested in the notebook because it enables me to add an eSATA drive via the express 34 slot?
2. What about RAID drives such as those offered by g-technology? These also seem to be a way to obtain good disk drive speed through striping. If these are good, then am I just as well off getting something like this and using with an iMac via firewire 800?
3. Should I get the best of both worlds by looking for an eSATA product with RAID O? Or is this overkill (i.e. would I do fine with just one or the other?)
Best,
Corey

Corey,
FW400 and FW800 both have sufficient bandwidth to handle video demands in Final Cut Express.
Since most modern hard drives can actually deliver more throughput than either Firewire spec, using SATA (or in your case eSATA) will usually give you better performance. FW800 can nominally deliver 80 MB/sec whereas SATA 1.5 can deliver 150 MB/sec and SATA 3G theoretically 300 MB/sec.
There are two situations where you may see a difference 1) if you have a camcorder that conflicts with other Firewire devices connected to your Mac at the same time (like many Canon models) or 2) when you are copying files/folders between drives. I don't think you will see much of a difference in routine editing in FCE.
Regarding Raid 0, imho the answer depends mostly on three questions - 1) have you covered your backup needs? Raid 0 does not provide backup, in fact Raid 0 alone (without some additional backup capability) actually increases the likelihood of data loss over time. 2) Are you doing enough video to need the benefits of RAID striping? 3) Do you have the budget - RAID will cost you quite a bit more than a plain external drive (eSATA and/or Firewire).
I think eSATA is probably the way things are headed in the market and if you have the choice you wouldn't go wrong with an eSATA express card/34 + external eSATA hard drive. Many of these external drives today support both eSATA and Firewire, just make sure that the actual drive inside is a SATA drive and not a PATA drive with an eSATA/FW bridge board.

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Title was edited by:
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Hi
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