I don’t know what it is about this 2GB thumb drive, but it’s incredibly slow in USB 1 mode, but not too bad in USB 2 mode. I tried copying this 600+Mb ISO to it from my Linux box with it formatted at ext3, ext2 and FAT32, and the fastest time was over 35 minutes. The same file to a 1Gb thumb drive in the same USB slot was only 11 minutes.
On my Powerbook, USB 2.0, that same file copied to the thumb drive in 2:43. Copying it to the 1Gb thumb drive took 2:04. So it’s only on USB 1 that the other one is dog slow.