At the moment there are two types of BD drives that can read UHD discs – “official” UHD drives and so-called “UHD-friendly” drives.
The “official” UHD drives do implement AACS2 protection, which means that in order just to read the data from the disc the software must present the AACS2 host certificate. At the time of this writing no such certs are publicly available, and certainly MakeMKV doesn't have one. This means that at the moment MakeMKV cannot even make a non-decrypted full disc backup of an UHD disc from such drive.
The “UHD-friendly” drives are regular BD drives that just happen to read BDXL media but do not implement AACS2 protection. One cannot use these with “official” software, but such drive allows reading UHD discs by any software with a regular AACS1 host certificate. In practice it means that MakeMKV can read these discs and can make a non-decrypted full disc backup. If a volume key is known for the disc ( see http://www.makemkv.com/faq/item/12 ) then MakeMKV could open the disc directly or could open a previously created full disc backup.
Same thing applies to many other software, including libbluray – having a “UHD-friendly” drive, a configuration file with a current AACS1 host certificate and disc-specific volume key, one can open a UHD disc in handbrake, VLC, or any other libbluray-based software.
Overall, the “UHD-friendly” drive is the best drive one can have at the moment. There are two known issues with these drives:
1. Some LG drives have trouble reading certain UHD media
2. All drives have a bug where drive “jams” the disc after it goes into power saving mode.
With current version of MakeMKV it means that you have to choose titles/tracks very fast after you open the disc – once the drive becomes quiet and disc stops spinning, you will get read errors after you press “Make MKV” button. The workaround is to make a full disc backup first. The next version of MakeMKV will have a workaround, so the clicking haste would no longer be necessary.
The “DeUHD” guys (as a note, buying their software is a waste of money, as it will likely become obsolete in a few months) invented the “UHD-friendly” classification and do maintain a current list of all drives which is presented below. The absolute best “UHD-friendly” drive at the moment is ASUS BW-16* series. It is cheap, fast, excellent writer, reads all discs, and comes as internal or USB3 external. More importantly it is future-proof, as it is not subject to AACS2 revocation. Buying this drive (for a price comparable to a single UHD disc) is highly recommended.
A very important note – whether you have an “official” UHD drive or an “UHD-friendly” drive, do not update its firmware under any circumstances. Firmware update cannot fix disc reading or standby issues, but easily can do many bad things to your drive. Just don't do it, no matter how tempting it looks.
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UHD friendly drives: LG BE16NU50 LG WH16NS40 LG BH16NS40 ASUS BW-12B1ST ASUS BC-12D2HT ASUS BW-16D1HT ASUS BW-16D1HT-PRO LG BH16NS55 LG WH16NS58 UHD official drives: LG WH16NS60 LG BU40N LG BU50N