Excessive disk I/O after ejecting external storage device (USB, firewire)

Hi all,
I've noticed a problem in my macbook pro that every times after I ejected a storage device, say SanDisk through a USB 2.0 card reader, I found about 20G+ bytes were wrote on the start disk. The excessive disk I/O brought the performance to its knees, and I can only recover it by reboot the computer. It looks like the data written on the disk were gone after reboot. Is there a way I can trace what has been written?
Thanks

Jovahn,
Welcome to the Apple Discussions!
Unfortunately, external USB drives are not well supported on PPC Macs such as the eMac (later Intel CPU Macs do have better support for USB external USB drives, including booting). Regrettably, if the USB drive manufacturer doesn't have decent Mac drivers available, I don't know of a real fix, short of selling the USB drive and picking up a Firewire one. Or, pick up a Firewire enclosure, which is fairly cheap, and put the actual hard drive from the external USB enclosure in the Firewire enclosure --- PT: HD drive replacement tips should provide some good pointers.

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