Clean install of Gutsy final. copy a 350mb avi file at times is slow but can 
also start transferring at 120+mbs, then within seconds it drops to around 
50mbs which by this time it has finished copying. I have noted it going as slow 
as 14mbs from 122mbs.
Transferring a large avi file of 900mb always starts at about 11mbs, drops as 
low as 6mbs but increases to 20mbs as the copying nears 100% complete.

copying from an ext usb hdd stays at about 25mbs from start to finish, i
believe this would be about max due to the usb limited bandwidth.

> sudo hdparm -tT /dev/sda
Timing cached reads:   856 MB in  2.00 seconds = 427.16 MB/sec
Timing buffered disk reads:  190 MB in  3.00 seconds =  63.25 MB/sec

wd 320gb 7200 16mb

asus p5p800-mx
865G PE/P
ICH5/ICH5R

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Slow SATA performance
https://bugs.launchpad.net/bugs/119730
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