I've been using the LG 4040B for a few years now, and it's done me a GREAT service (and still actually WORKS), but now it's time for me to upgrade. I need to be abel to burn DVDs faster, and 4x just doesn't cut it anymore. I want t get the GSA-4160B, which can burn faster discs and do dual layered, but I see that there's also a GSA-4160BI model. I read the specs on BOTH and can't seem to notice any difference between the 2. Does anyone out there know what the difference is between the 2 models? Any help would be appreciated!