Lite On 165H verses 166S

What is the difference between the two drives
LTD 165H and LTD166S.

I also just flashed my 165H to CHOQ.
In the device manager it states UDM mode 2?
I thought the 165H ran in UDM mode 3.
as per the specs of the drivr on Lite On site

Is there any reason for concern? :confused: I

Wow our setups are alike! (Just look in the sig)

I just built this rig and I love it.
Our rigs are alike :cool: