Hi mate,
did you solve your PIO trouble ?
I just got same issue with my system HDD ( got 5mo/s in HDtune insteed of the 55mo/s ???) I was in PIO mode and can't change the setting in windows or in bios .
After checking google I found the way to reactivate the UDMA mode :
GO in regedit and look after these key:
HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/Control/Class{4D36E96A-E325-11CE-BFC1-08002BE10318}�00x
the ?00x is your supposed number for your PIO drive
when you found it , deleted it ( save it first if you want) and reboot, now all should be fine.
My first attempt was wrong drive number but at the second one I got success. I had to reinstall my intel chipset driver by the way.
In my case I have had to deleted the n°0002 , here is a picture of it:
Now, all seems to be fine.
Hope it solve your trouble too.





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