@JTZ, thanks for your logs and error report. Can you please:

1) also attach the similar output for the kernel 2.6.31 (or karmic) ? 
2) It will be great if you could paste a bigger output of dmesg i.e messages 
before the error message as well. 
3) Also try this: 
    a) make this file (if it does not exist) in /etc/modprobe.d/options
    b) make/add an entry in it:  
        options libata udma/100
    c) *copy* your current initramfs somewhere safe (in the event you fail, 
this will be needed)
    d) fire the following command to update your existing initramfs:
        update-initramfs -u
    e) reboot and get the output of hdparm -l /dev/sda and attach it here.
    f)  test if your data copy works now with this new speed.

-- 
sata_via hard resetting link / freeze: exception Emask 0x12 SAct 0x0 SErr 
0x1000500 action 0x6
https://bugs.launchpad.net/bugs/422994
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