this post was submitted on 23 Nov 2023
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Data Hoarder

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We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.

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Why are 100 GB Blu-rays so much more expensive? (alien.top)
submitted 11 months ago by [email protected] to c/[email protected]
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I have recently thought about burning some data to Blu-ray and therefore looked for some cheap blank discs. To my surprise, higher density Blu-rays seem to be much more expensive than lower density ones. In my country (Germany) for example, I could buy a 25 GB BD for 0,44€. A 100 GB BD would cost me 8,77€! At that price, it would be more efficient to store 100 GB on four 25 GB discs instead of one 100 GB disc (1,76€ vs. 8,77€). Sure, if it is one file I would have to split it first and combine it again when I want to access the data, but that effort seems to be worth it.

Why are high capacity Blu-rays so much more expensive, especially compared to HDDs or SSDs where the price per GB/TB usually drops with higher capacity?

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[–] [email protected] 1 points 11 months ago (1 children)

BD-XL is a magneto-optic format, like DVD-RAM was. It requires dirrefent technology than pure optical BDs and hence the media are way more expensive.

Supposedly BD-XL last way longer and are used for archiving data.

[–] [email protected] 1 points 11 months ago

BD-RE XL you mean. Sorta. It was/is much more like DVD-RW functionally than DVD-RAM.

DVD-RAM was truly trackless MO. You could format one with any HDD/SSD file system.

BD XL is the best consumer archival media out there. But it's not cheap compared to stashing a few 18TB drives in different locations with a Faraday cage.