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This has some technical problems, and I will probably paraphrase certain sections. This really has nothing to do with the device – the software and hardware.
Blu-ray API bug on Mac OS X NOTE: The text below applies only to 'OS access mode'. Starting with version 1.6.4 MakeMKV introduces DASPI disc access mode that is faster and more stable than 'OS access' mode. DASPI kernel extension is included with MakeMKV. Mac OS X version 10.4 'Tiger' and below don't provide any Blu-ray API and MakeMKV has to use so-called 'direct access' API that works only with write-capable drives and is significantly slower compared to regular read access. A separate rant on this matter can be found. Mac OS X version 10.5 'Leopard' and above support Blu-ray discs and feature API for Blu-ray specific AACS key exchange. So, at least in theory, any program can read data and key material from Blu-ray discs without obtaining exclusive disc access and from any capable drive.
But there is a catch. The API has a bug in it that prevents its usage without workarounds, and for small subset of drives there is no workaround at all. The bug prohibits release of a system resource so in a worst case you'll have to shut down and power on after opening every single Blu-ray disc.
Apple has been notified about this bug but apparently ignored it. What is the bug Two functions - IOSCSIMultimediaCommandsDevice::REPORTKEYV2 and IOSCSIMultimediaCommandsDevice::SENDKEYV2 in IOSCSIArchitectureModelFamily / IOSCSIMultimediaCommands / SCSIMultimediaCommands.cpp have the same error that prevents sending INVALIDATEAGID command to a Blu-ray drive. Per both SCSI MMC and AACS specifications this command shall have no data payload but OS X driver requires non-zero data buffer. The same command for DVD discs is implemented correctly. What are the workarounds When MakeMKV detects the bug it tries to use a workaround specified in preferences.
In the best case a workaround will fix the problem; in a worst case a workaround will crash drive's firmware and reset would be required. In no case will any workaround permanently damage the drive. Type 0 - invalidate DVD AGID MakeMKV will invalidate DVD-specific AGID instead of Blu-ray one. This will work for drives that use the same AGID slots for Blu-ray and DVD. In the worst case workaround won't work.
Type 1 - data underrun MakeMKV will supply a buffer for REPORTKEY command despite specification requiring no buffer. Most drives will ignore the buffer and return zero data but some will hang or behave erratically.
Aacskeys uses this workaround. Type 2 - data overrun Similarly to type 1 workaround, MakeMKV will supply a buffer for SENDKEY command despite specification requiring no buffer. Some drives will ignore the data, some will return an error and some will hang. Use it as a last resort. Conclusion If none of the workarounds works for your particular drive, your choice is to use slow direct access mode, change drive, or call Apple and make them fix the bug in their OS.
Starting from OS X 10.4.4 Apple doesn't release source code for IOSCSIArchitectureModelFamily driver. NOTE: Installing DASPI kernel extension will fix this problem once and forever.
When I connect UP-D70A, UP-D8800 or UP-D5500 to the Adaptec AHA-2940U2W on Win95, Win98 or WinNT4.0, computer hangs up. (Cause) The minimum synchronous transfer speed of this SCSI adapter is 5MB.
However, these printers return as 4MB. This causes SCSI negotiation failure. (The adapter does not regard the printers as synchronous transfer devices.) (Countermeasure) For UP-D70A and UP-D5500, there are updated printer firmware. Please contact your nearest Sony service station for firmware upgrade. For UP-D8800, please disable the 'Initiate Sync Negotiation' in SCSI adapter BIOS setting as below.
After this setting, communication between the printer and this adapter becomes asynchronous. This setting will not produce any bad effect for printing time, etc.The following setting is effective for UP-D70A and UP-D5500 if you do not upgrade the printer firmware.
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(How to setup?). 1. When the message of 'Press 'Ctrl+A' for SCSI Select Utility!' Is displayed while starting the PC, press keys of 'Ctrl+A'. Adaptec AHA-2940U2W setup screen appears. Choose 'Configure/View Host Adapter Settings' and press 'Enter' key.
Choose 'SCSI Device Configuration' and press 'Enter' key. Move the cursor to the SCSI ID number which the printer is connected and set 'No' for 'Initiate Sync Negotiation'. Which PCI SCSI card do the printers/scanner support? UP-D70A/XR, UP-D2550S, UP-D2600S, UY-S77 and UY-S90 support the following Adaptec PCI SCSI cards. PowerDomain2940UW.
PowerDomain2940U2W. PowerDomain3940UWD.
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SCSI CARD2906. (.1) Please use the latest firmware of the Adaptec PCI SCSI cards. (You can download the latest firmware on the Adaptec HP. (. (.2) In case you use the UP-D70A, please use the latest driver.
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(You can download on the 'http://www.sony.co.jp/DP-driver-E'.).