Hard disc? Do you mean optical disc? The only movies distributed on HDD are only available to movie theaters for commercial use AFAIK. Typically spelling disk with a "c" indicates an optical medium.
I agree that there are advantages to having "hard copy", but strongly caution against anyone believing that they'll really be able to "buy once" by buying Blu-ray. DVD video discs use the Content Scrambling System (CSS), which fortunately has been cracked and published world-wide. (Note that's still a crime in the US!) Thanks to the computer industry's support of DVD, you will be able to rip your DVD, and store it for future viewing long after the last DVD-compatible player has died.
With Blu-ray it's a different story. The DRM is far more sophisticated, proprietary and secret. Companies like Sony are working hard to make sure that you can't use their Blu-ray releases, except under their very selfish and increasingly restrictive terms. Compatibility issues are not uncommon, and bound to increase. And since most Blu-ray players only have HDMI outputs, with their own proprietary encryption methods, the fact is that Blu-ray viewing is a house of cards that's way too easy to collapse.
One day soon, Sony and/or its other big business counterparts could decide to make Blu-ray obsolete by force. I wouldn't be surprised if the encryption algorithms don't already have a "drop dead" date programmed into them. When that day comes, your Blu-ray collection may still be a collector's item, but the content of discs will be unplayable.
There are precedents in the DRMed music distribution industry. Companies have gone out of business (or gotten out of the business), and when their decryption keys disappeared from the Internet, so did the ability to play the DRMed content. On the Blu-ray side there have been compatibility issues with new Blu-ray releases having DRM schemes that early Blu-ray players don't have decryption software for. You can keep on buying new Blu-ray players, but because there's no law requiring new players to support every last encryption scheme, both old and new, you may need to maintain a rather large collection of players of several vintages and the necessary HDMI hardware with its own set of keys that must match the various players. That's a big commitment to make to a product that you'll never truly own!
http://www.rollingstone.com/music/news/wal-mart-closes-down-drm-operat ions-makes-music-unplayable-20080929
https://www.eff.org/pages/customer-always-wrong-users-guide-drm-online -music
https://www.eff.org/issues/drm
http://www.zdnet.com/blog/hardware/update-x2-avatar-blu-ray-drm-bites- legitimate-customers/8193
http://arstechnica.com/gadgets/2007/10/new-blu-ray-discs-with-bd-drm-f ailing-to-play-on-some-devices/
The notion that having it in your hands gives you complete control is out of date. Sad but very true.
As for the "superior-quality Betamax" myth, The theoretical maximum horizontal resolution for original Betamax was only 10 lines more than original VHS, a paltry 4% difference that would be mighty hard for the best eyes to detect! Compare that to the whopping 32% difference from broadcast quality at ~330 lines!
Remember that's only at the fastest tape speeds. To be able to store a 2 hour movie on Betamax, users had to either split it among 2 cassettes (which was a losing proposition for video rental stores) or select a slower tape speed, and at that speed Betamax video quality was clearly inferior to VHS, which thanks to the larger cassette could record 2 hours at full quality. Also note that while VHS equipment makers refined their product to give specs equal to or better than Betamax, but Sony never produced a larger Betamax cassette to allow recording feature films at best quality.
Sometimes qualities other than specsmanship are the ones that really matter.
As for 4K, as a producer of video content, I will be buying 4K (or maybe 8K) gear sooner or later to keep pace with the industry. However as a consumer of video content I'm in no hurry to upgrade. Since most of what I watch is still produced for 1080i (some still for 720p!), there's no point in doing so any time soon. I'm also wary of the use of extremely lossy compression that's used for retail distribution of 4K content. To me it looks a lot like robbing Peter to pay Paul!
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