FW800 has zero application and zero advantages on the iPod front, so we'll just throw that away outright. Yes, it's much faster, but no, it doesn't matter when the hard drive is slow.dmcelroy said:Apple may be going with smaller form to attract buyers, but don't forget...firewire 400 is nearly twice as fast as USB2.0. Firewire 800 even more so.
Now, from your own link at Barefeats (a dubious source of benchmarking, to put it mildly), comes this part:
"The Windows PC implementation of USB 2.0 puts the Mac to shame. Today we tested the same USB 2.0 drive/enclosure on a Windows PC (3GHz Pentium 4) with built-in USB 2.0 on the motherboard, similar to Apple's approach. We measured 33MB/s READ and 27MB/s WRITE."
That is in line with the 35/30MB per second transfers of FW400 (in other words, within the same performance margin). Apple's apparent crippling of USB 2.0 is not likely to have been the case after Tiger's release, but if you can provide a benchmark performed in 2005 comparing speeds that suggests anything more than a 10-15% difference, then you might have a valid point, but that's not the case.
EDIT:
Just to clarify, the key issue isn't whether USB or Firewire is intrinsically faster (because it's already known that Firewire can sustain high transfer speeds better than USB), but that when you're copying thousands of files, you aren't using a sustained connection, so Firewire loses most of its transfer-rate edge. Also, if you've got a few Firewire devices connected, you get sketchy performance when the FW bus fills up. Isochronous transfers are better until you saturate the bus, where the whole FW bus falls to its knees and stops recognizing drives and transferring data.
There are plenty of more accurate reports easily accessible online, including this one, which I've found to be accurate:
File copying
Transfering 1GB in 1 file vs. 9226 files
Direct ATA: 43.8 sec vs. 1m 15.4 sec
USB 2.0: 1m 20 sec vs. 1m 30 sec
FireWire: 48.9 sec vs. 1m 18.4 sec
(source: http://www.digit-life.com/articles/usb20vsfirewire/)
Other places where USB 2.0 and FW are compared realistically:
http://www.soundonsound.com/sos/apr04/articles/pcnotes.htm
http://www.usb-ware.com/firewire-vs-usb.htm