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Hi, i just brought a Liteon 166S and it can read CDs well and fast too. however, if I put in a DVD, it will read only up to 3/4 of the DVD and starts slowing down and quit. Not sure if it's a defective drive, if so, i will return it or is there other solution to this problem?

yeah you should've gone with Pioneer 120

if it looks something like this



then this is normal for a dual-layer DVD.