this post was submitted on 22 Sep 2024
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Huge Half-Life discovery found from a decades-old CD sitting in a storage unit (www.pcgamesn.com)
submitted 3 months ago by [email protected] to c/[email protected]
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[–] [email protected] 7 points 3 months ago (2 children)

CD - red laser

BlueRay - blue laser.. shorter wavelength --> more data on same size disk

and inbetween there was DL - dual layer
light scribe - could etch a picture on the top of the cd
and RW - rewriteable CDs

(CD is short for compact disc)

[–] [email protected] 1 points 3 months ago (1 children)

CDs like laserdiscs before them are read with an infrared laser.

DVDs use a red laser, and Blu-ray does indeed use a blue-violet laser. The smaller wavelengths, plus the ability to do multiple layers, are indeed how they cram more data more densely onto a disc of nearly identical size.

[–] [email protected] 1 points 3 months ago

I stand corrected. thx

[–] [email protected] 1 points 3 months ago

light scribe

I remember having one, but I never actually etched a picture onto the CD, it never seemed worth doing.