FW vs. USB & can you move a backup folder to a larger drive later?

I'm about to get an external drive to use for TM. Is Firewire (400 or 800) going to be noticeably faster than a USB drive? I ask because I would think that a single external platter can only transfer so much data to the disk at once and USB might be fast enough to keep the drive maxed out as far as write speed.
I have a 320 GB internal drive in my iMac and have used 125 GB so far (195 GB free). I'll probably get a 750 GB external drive for TM. If it fills up in 6 months (give or take - I don't add/change that much data per day) can I then buy a larger, say 1.5 TB drive and copy the TM backup folder to the new drive and have the TM app see all the old backups on the new drive?
Thanks in advance

engstrom,
Best I can tell, drives are currently topping out at about 1.5 Gbs/sec. This is for 7200 RPM external drives, connected on an eSATA bus. So yes, a very large benefit can be realized by using your best bus for connecting an external drive.
I have just such a drive, but I am using its Firewire 800 functionality (I haven't yet picked up an eSATA Expresscard). In real-world use, it will transfer about 3 GBs (that's gigaBytes) a minute, over the Firewire 800 bus. I am interested to find what it will do over eSATA, once I pick up a card.
If transfer speeds are a concern to you, I do recommend that you get the best drive you can, and use the best connection you can. USB will be somewhat slower than FW 400, and FW 400 is half the speed of FW 800.
I'm not certain that you're going to be able to transfer the backup on one drive to another. You may need to start over with a new "full" Time Machine backup, then continue from there. There's no problem with copying the Time Machine backup to another drive, and there is no problem with then changing Time Machine's preferences to use this new drive. What I'm not sure about, however, is that Time Machine will then recognize the existing backup as "its" backup, and not some other machine's. Not having had the chance (or cause) to test this yet, I'm just not certain.
Even if it turns out that Time Machine will not recognize the copied backup, it's not that big a deal. Your older backup will still remain on the old drive; you'll just have your backups spanning multiple drives. In the end, this might be better anyway, since more space will be available for your future backups.
Scott

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