strange, it is too slow even for coping from one partition to another on
the same hd. it's look like some hardware isn't configured properly.
maybe u should try to manually set one of UDMA mode (max from available,
but first try set max UDMA with software) (not PIO). it helps me on
feisty and also works nice in gutsy. btw, it works 4 me fine on ext2 as
well as on ext3.
also notice, u can have USB2 interface, but not true USB2 speed. btw, it
will took some resources while coping from /dev/zero.