On Wed, 2005-02-09 at 07:26 -0200, Henrique de Moraes Holschuh wrote: > On Tue, 08 Feb 2005, Ron Johnson wrote: > > > > > and there is USB2 which is > > > > > good enough and nearly always supported. > > > > > > > > USB2 is much slower than firewire, and if a slow device is plugged > > > > > > So what, if it is fast enough? I do not need a 1GB/s (or 2GB/s, I forget) > > > channel to connect a single 320Mbit/s device. > > > > ???????????? > > Firewire is either 1GB/s or 2GB/s I think. A typical HD is about 320Mbit/s > sustained, even if it can get a bit better during bursts. Plain old firewire (IEEE 1394-1995 & IEEE 1394a-2000) is 400Mbps. The newer IEEE 1394b is 800Mbps. Nowhere *near* 1GBps (8Gbps). > > I myself tested an external HDD that had both firewire & USB2 > > jacks. And then I attached the drive to the IDE chain. > > > > Internally, the drive got 55MB/s > > With firewire, the drive got 30MB/s > > With USB2, it got 12MB/s. > > This is USB1.1, not USB2. Something in your chain did not get validated as > USB2. Incorrect. The maximum Utopian "Full speed" USB is 12 Mbps (1.5MBps). Thus, when I got 12MB/s (96Mbps) effective throughput, it had to be using high-speed USB2. The 96Mbps speed that USB2 reached on my system is only 20% of it's theoretical maximum. The 240Mbps (8 * 30MBps) that 1394a reached on my system is 60% of firewire's theoretical maximum. > > The only thing that USB is really good for is really slow stuff > > like mice, keyboards, drawing pens, etc. > > Sorry, but I don't agree with you. It works well for moderately fast > devices as well. IF you have it working as USB2, of course. I did. What USB has going for it is that it is *cheap*. -- ----------------------------------------------------------------- Ron Johnson, Jr. Jefferson, LA USA PGP Key ID 8834C06B I prefer encrypted mail. "A woman should dress to attract attention. To attract the most attention, a woman should be either nude or wearing something as expensive as getting her nude is going to be." P. J. O'Rourke
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