USB 1.1 - possible transfer speeds of over ~600kb/sec?

Hello
I have an old iMac Flower Power. Needless to say, it's limited to the old USB 1.1 specification. What I've found is that when attempting to transfer files to external drives (that can copy at 30 MB/sec+ via USB 2), I am limited to about 500 to 600 KB/sec transfer.
Now, USB 1.1 is supposed to support 12 megabit per second - 1.5 MB/sec - per bus. The iMac possesses two USB busses, one for each port. While I know there is speed loss to system overhead, I would think that a greater than 50%-66% speed drop is rather extreme - especially since these drives were connected directly to one of the iMac's USB ports - no hubs or other devices in between.
Is this a limitation I can't get around, or is there some other reason that it's being limited that I could possibly fix/optimize for a bit higher speed?

Hello
Yah, I figured as much. Still, only having a bandwidth that's a third of what it's supposed to be is a rather ridiculous drop, don't you think? At least USB 2 is a bit better - I've been able to get a bit over 30 MB/Sec transfer with a fast external hard drive, which is at least half the theoretical bandwidth. I was just hoping there'd be a way to squeeze out a little extra performance.
As far as firewire goes, yes indeed! The problem is that I only have 3 firewire devices - an old iPod, a desktop hard drive (used for video editing), and a small portable hard drive. It works for transferring files, but it doesn't work for what I often need - my 1 TB primary media drive is USB, and flash drives don't come in Firewire.
Oh well, I suppose that's what you get when you try to use old hardware, eh? I hope somebody someday figures out how to use Firewire or ethernet to make a USB connection with some sort of adapter. Not likely, but I can dream. Now if only I could make the airport card adapter work with a USB PCMCIA card...?

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