On: The Reliability of Optical Disks

[robocat]

Blu-ray discs use a red laser, and CD-ROMs use an infrared laser. The drives contain two laser diodes. Skip to 5:50 in https://www.youtube.com/watch?v=h9lbrr04XBQ

[neuralRiot → robocat]

Blu-ray uses blue laser (blue-ray!) DVD uses red and CD infrared. Devices compatibles with the 3 mediums have 3 lasers on their optical pickup.

[robocat → neuralRiot]

Thanks. I anti-corrected it to red from blue when I found the video, and the statement felt really wrong when I wrote it, but I thought fuck-it - the video link is too good to miss! Lazy me.