this post was submitted on 23 Feb 2024
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387
DVD-like optical disc could store 1.6 petabits (or 200 terabytes) on 100 layers (www.techspot.com)
submitted 9 months ago by Wilshire to c/technology
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[–] Donjuanme 14 points 9 months ago (1 children)

I suppose with that much data capacity they could halve the storage and add redundancy. My question is will it only have 1 reading head? That much data is going to take a very long time to read, unless they're doing multiple layers at a time,

[–] GermainRobitaille 6 points 9 months ago (1 children)

With a rate 1/2 you can't expect to correct more than 5.5% of errors.

[–] [email protected] 11 points 9 months ago (1 children)

I am unfamiliar with the math used to calculate that value.

Would it not work like a parity RAID where each sector would have parity bits in a different location on the disc?

[–] foggy 1 points 9 months ago

I'm not familiar with it either, but I'd say that using RAID on a single disc is silly... There's a good reason it's not a common practice on single HDDs.

A scratch on the disc usually means many scratches on the disc.