High CPU usage when copying files to USB mass storage device

[某因幡]

Hi,
I've tried to copy some different files to an USB flash disk and an USB HDD
and tried different USB hubs.
After a while the system gets very slow, switching between windows can take
quite a while. The copying speed is slow, too(only several MB/s to an empty
USB HDD).
The machine is not old, just bought it this year. And on the same machine
the same problem is not seen on Ubuntu 10.04 and Windows 7.
Any ideas?


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