With password protection and hardware encryption, this WD My Book external hard drive allows you to protect and privatize your stored documents. The 4TB capacity delivers ample space for videos, photos, music and other files. If you have tons of movies on Blu-ray, and want to copy them to External 4TB WD My Book on iMac Retina 4K for streaming with your Apple TV 4, Samsung TV, PS4, WD TV etc, you need to convert Blu-ray to External 4TB WD My Book compatible MP4 or MKV format first. 
Solution: Rip the Blu-ray, and produce the media file(s) you need. This seems to involve ripping the Blu-ray, and then converting to the desired format.
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To be sure, most of you know how to rip Blu-rays, and have been doing so just fine. The problem you face is how to rip Blu-ray to a External 4TB WD My Book proper format with best settings for External 4TB WD My Book streaming while maintaining the highest quality possible. As far as we know, MP4, MKV are commonly supported formats for computer, Apple TV, iOS devices, Roku player, etc via streaming videos from External 4TB WD My Book on iMac. Thus, what you need is a professional Blu-ray ripping tool that supports converting Blu-ray to MP4/MKV for External 4TB WD My Book streaming with the best quality.
Pavtube BDMagic for Mac (including MacOS Sierra, El Capitan) is the recommended Blu-ray to External 4TB WD My Book converter for you. With this best Blu-ray ripping software, you can decrypt Blu-rays and lossless re-encode Blu-rays to MKV, MP4 format and compress 1080p Blu-ray to compatible size for External 4TB WD My Book Via iMac Retina 4K. Of course, this Blu-ray ripper can help you convert commercial Blu-ray movies to AVI, WMV, FLV, MOV, etc as well. What’s more, it can also enable you to rip Blu-ray for directly playback on Android, iOS, Windows based devices. If you are using Windows, you can also use the Pavtube BDMagic. Just download it and follow the steps below to learn how to do it.
How to rip Blu-ray to External 4TB WD My Book for streaming Via iMac Retina 4K
Free Download MacOS Sierra Blu-ray Ripper for External 4TB WD My Book: 
Other Download:
- Pavtube old official address: http://www.pavtube.cn/blu-ray-ripper-mac/
- Cnet Download: http://download.cnet.com/Pavtube-BDMagic/3000-7970_4-76177782.html
Step 1. Load Blu-ray Files
Insert your Blu-ray disc to the drive, then launch the Blu-ray ripping software and click the “Load Disc” button to have the Blu-ray content imported. You can also add Blu-ray discs(with BD drive), VIDEO_TS folder, Blu-ray/Blu-ray ISO files are the source files for converting. 
Step 2. Select External 4TB WD My Book friendly format
Choose output format. This produces a video file for each movie that is compatible with External 4TB WD My Book, since most users would like to play the movie on all devices from External 4TB WD My Book, we recommend you to choose MP4 format, which has best video compatibility. 
Tip: With the right settings you can retain the quality of the original Blu-ray while also saving space. This is particularly helpful when streaming over your network, depending on your network quality. Simply click Settings bar and you can tweak the settings to your satisfaction and even save it as preset.
Step 3. Start ripping Blu-ray to External 4TB WD My Book
When everything is done, click the “Convert” button to start converting Blu-rays to External 4TB WD My Book compatible video files.
Once the conversion is finished, click “Open” to quickly find the converted movies. Then, External 4TB WD My Book will recognize, catalog, play and stream these Blu-ray rips via iMac Retina 4K (MacOS Sierra, Mac OS X El Capitan) at ease.
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