There is an easy way to determine what drive you have in your console without actually fully disassembling it, all you need do is remove the faceplate (see image below; turn the console sideways with the power button facing upwards and pull outwards from the very edge of the faceplate)

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Then check the hole in the front of the dvd drive, refer to the image below :

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There, saves alot of hassles with identifying your drive make, you then know what you are in for before even full disassembly.