It seems that the problem may be related to the fact that the IDE drives are 
now handled by the SATA drivers and thus in some cases hdparm can't set options 
correctly on some drives.
As i said i have 2 IDE drives in my computer one issue slow down the other not 
so feel free to ask me any output that would help you to find what is the 
configuration option which make the second hard drives to work slowly.

For the record some have noticed also this slow down on suse with the
kernel 2.6.20 so there's really something with the way the 2.6.20 kernel
is handling IDE drives.

Hope this can be improved and a workaround released.

-- 
kernel 2.6.20 disk write performance much slower than 2.6.17
https://bugs.launchpad.net/bugs/113532
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