Why does my laptop have problems with USB card reader?

I have a PowerBook G4, and I connect a multi-slot card reader to a USB port to read CompactFlash media. I have two problems with it and wonder if anyone can help.
1) When I "eject" the media, then physically remove the media from the card reader, I occasionally get a "Media not removed properly" alert message. I always wait several seconds after the media icon has disappeared from the desktop before removing the media. I can't seem to reproduce this on demand, but it appears to be happening more frequently.
2) Once the media has been removed from the card reader, the computer no longer recognizes it when it is reinserted into the card reader. I have to unplug the card reader from the USB port, then plug it back before the media is recognized.
Any ideas how to resolve these issues?

1) Wait longer. It can sometimes be necessary to wait as long as 15 seconds. I've never seen a good explanation of why.
2) Are you plugging the reader directly into a USB port on the Powerbook? Are any other bus-powered USB devices connected simultaneously? If so, disconnect them and test again. If you have an AC-powered USB hub available (or can borrow one), try plugging that into the computer and the reader into the hub. (Don't use a bus-powered hub.)

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