When I plugged in a USB flash drive in the USB port of my Performa 6360 ( OS 9.1 ) it wanted to format the flash drive before i could use it. Fine. Format away.

Then i wanted to use another ( a second USB flash drive ) to hold totally different data but i formatted that USB flash drive using Apple's Disk Utility/SnowLeopard.

However when i plugged in that second USB flash drive in the USB port of my Performa it wanted to format/initialize it ( again ).

Why?