Internal optical drive, UHD official drive Internal slim optical drive, UHD friendly If the 4K UHD drive is not friendly, refer to the third segment of this guide to learn how to make it friendly. ![]() How to tell if the drive is 4K friendly? If it has a regular AACS1 host certificate, then the UHD is 4K UHD friendly. What that means is the ‘unfriendly’ drives may not grant you permission to copy or backup, and in some instances even to watch the UHD content. The ‘friendly’ drives can read regular BDXL media without implementing AACS2 protection, while the ‘unfriendly’ drives implement the AACS2 protection. There are two types of UHD drives, that is the ‘friendly’ and ‘unfriendly' 4K UHD drives. UHD drives are normally labeled ‘Ultra HD Blu-ray’ or something similar. Quite simply, a UHD Drive is an optical or external Blu-ray drive that can read BDXL media.
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